{"id":142111,"date":"2022-04-14T17:00:39","date_gmt":"2022-04-14T11:30:39","guid":{"rendered":"https:\/\/www.aakash.ac.in\/blog\/?p=142111"},"modified":"2023-07-10T17:35:32","modified_gmt":"2023-07-10T12:05:32","slug":"who-discovered-electrons-protons-and-neutrons","status":"publish","type":"post","link":"https:\/\/www.aakash.ac.in\/blog\/who-discovered-electrons-protons-and-neutrons\/","title":{"rendered":"Who discovered Electrons, Protons and Neutrons?"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Did you ever find yourself wondering \u2013 what are particles? This question is undoubtedly exciting yet confusing as its answer might twist your head and leave you confused. The beauty of the definition of particles lies within the wide variety of opinions on the topic.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A particle, in simpler terms, can be defined as a tiny bit of anything. There have been different opinions and discussions on its definition, yet all are interested in their particular ways. Whether it&#8217;s the chair in your house or the useless cardboard box you might have kept for no reason, everything is made up of particles.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Scientifically, particles are defined as a body having finite mass and internal structure but negligible dimensions. These tiny particles can also be classified as subatomic particles made of three constituents \u2013 electrons, protons, and neutrons \u2013 and they hardly take up any space.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">\u00a0<\/span>Atoms: A Brief<\/h3>\n<p><span style=\"font-weight: 400;\">The idea that everything is made up of atoms was first introduced by John Dalton. He published his theory in 1808, which was quick to gain the attention of all science enthusiasts. Dalton&#8217;s atomic theory was particular because it was the first of its kind to be supported by the law of conservation of mass and constant.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">There are four parts of Dalton&#8217;s atomic theory, where he puts forward the following conclusions:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">All matter is made up of atoms divided into many subatomic particles.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">All atoms present in an element are identical in their mass and properties.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Compounds are made up of two or more different types of atoms.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A chemical reaction rearranges an atom.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Atoms generally contain space. The nucleus present in the centre of an atom is positively charged and mainly contains its mass. It is made up of protons, which are positively charged, and neutrons, which generally have no charge. These atoms are primarily surrounded by electrons, which are generally present in all atoms and are negatively charged.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Let us see how these three components of atoms were discovered.<\/span><\/p>\n<h3>Who Discovered Electrons?<\/h3>\n<p><span style=\"font-weight: 400;\">Electrons are low-mass, negatively charged particles present in all the atoms. It acts as a primarily sole carrier of electricity in solids.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">It was first discovered by J.J. Thomson, who carried the experiments in a discharge tube by taking the gas at low pressure of 0.01mm Hg. Thomson took two parallel aluminium plates and shot a beam of cathode rays between them.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">He observed that the movement of the rays after being directed towards the end of the tube was highly dependent on the nature of the aluminium plate. According to his observation, the rays moved up when the upper aluminium plate was positive and vice versa.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">He also observed that the deflection of cathode rays was proportional to the potential between the aluminium plates. After playing both kinds of deflections, Thomson concluded that the rays contained negatively charged components. He proceeded to name this component electron.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Although Thomson successfully marked finding the existence of electrons, he could not jot down the exact value that it held. The charge value electrons hold is calculated by Robert Millikan, a well-known American physicist.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Millikan&#8217;s famous work \u2013 the oil drop experiment \u2013 is credited for finding the value of electrons. He measured the electron&#8217;s charge to be 1.6*10-19 Coulombs, a value that is of extreme importance even today. His experiment revolved around dropping negatively charged oil droplets and inferring the observations.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">To know more about the electrons, refer to the <\/span><a href=\"https:\/\/www.aakash.ac.in\/important-concepts\/chemistry\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">Important Concepts of Chemistry<\/span><\/a><span style=\"font-weight: 400;\"> and <\/span><a href=\"https:\/\/www.aakash.ac.in\/ncert-solutions\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">NCERT Solutions<\/span><\/a><span style=\"font-weight: 400;\"> and enhance your preparation levels.\u00a0<\/span><\/p>\n<h3>Who Discovered Protons?<\/h3>\n<p><span style=\"font-weight: 400;\">Protons are positively charged particles present in all the atoms and generally in the nucleus of a hydrogen atom. Ernest Rutherford first discovered them in 1911 through his most famous experiment called the gold foil experiment.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Rutherford worked with alpha particles to go about this experiment. He set up an alpha particle emitter in front of a zinc sulphide (ZnS) screen. This screen was fluorescent.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">After that, he kept a fragile gold foil between the alpha particle emitter and the screen. Once the setup was ready, he projected the alpha particles on the gold files and observed their nature of deflection.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Based on the above experiment, Rutherford was able to draw the following operations:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The majority of the alpha particles emitted could pass straight through the gold foil. They banged straight in front of the zinc sulphide fluorescent screen.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">However, not all alpha particles travelled in a straight line. A significant few amongst the straight travelling alpha particles ended up on a slightly deviated path. They went through a fraction of deflection, and hence the hits on the screen were slightly to the side of the straight deflection hits.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">There were very few alpha particles that we could completely bounce back. One about 20,000 alpha particles were able to retrace their path back after a deflection from the gold foil.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Through the above observations, the following conclusions were drawn:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The majority of an atom&#8217;s mass is concentrated in its nucleus. It contains positively charged ions and is a small core located in the centre of the atom.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">There were negatively charged ions, called electrons, revolving around the nucleus. Since they numerically combine to be equal to the combined charge of protons, the charge of an atom is neutral.<\/span><\/li>\n<\/ul>\n<h3>Who Discovered Neutrons?<\/h3>\n<p><span style=\"font-weight: 400;\">Neutrons carry no charge present in all the atoms and have the same mass as protons. Sir James Chadwick first discovered neutrons in the year 1932. He was also awarded in the year1935 with the Nobel Prize in physics for the same discovery.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">James Chadwick did his experiment on a beryllium sheet, which led to the production of uncharged radiation. This radiation was observed with the help of an ionisation chamber. Thus, he concluded that uncharged particles have the same mass as a proton.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Before Chadwick&#8217;s discovery, scientists confused neutrons with photons. However, Chadwick used the Joliot curie experiment and changed the bombarding target \u2013 using targets other than paraffin. He continued to analyse and infer what happened after he bombarded these particles on different targets \u2013 and finally concluded that this uncharged component of the atom was, in fact, not a photon but something else.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Chadwick fired neutrons at the targets, which were rich in protons. The results of this experiment included neutrons smashing protons and knocking them out. He calculated the mass of this new particle, now known as a neutron \u2013 and discovered that its mass was slightly more than a proton.<\/span><\/p>\n<h3>Conclusion<\/h3>\n<p><span style=\"font-weight: 400;\">Hence, to sum up, we have covered the discoveries of the three components of atoms:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">JJ discovered electrons. Thomson in the year1897.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Rutherford discovered protons in the year 1911.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Chadwick discovered neutrons in 1935.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The discoveries of these particles are fundamental even today. The values and experimental observations gifted to us by these well-known and genius scientists have helped us solve numerous problems in our daily life.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">These discoveries have also paved the way for several other discoveries and refinement of theories \u2013 carried out by scientists these men deeply inspired.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If you are looking for <\/span><a href=\"https:\/\/www.aakash.ac.in\/neet-syllabus\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">NEET Syllabus<\/span><\/a><span style=\"font-weight: 400;\">, <\/span><a href=\"https:\/\/www.aakash.ac.in\/jee-main-syllabus\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">JEE Main Syllabus<\/span><\/a><span style=\"font-weight: 400;\">, <\/span><a href=\"https:\/\/www.aakash.ac.in\/cucet-syllabus\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">CUCET Syllabus<\/span><\/a><span style=\"font-weight: 400;\">, <\/span><a href=\"https:\/\/www.aakash.ac.in\/kvpy-exam\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">KVPY exam<\/span><\/a><span style=\"font-weight: 400;\">, and other <\/span><a href=\"https:\/\/www.aakash.ac.in\/olympiads-gateway-global-recognition\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">Olympiads<\/span><\/a><span style=\"font-weight: 400;\">, then check out these links and crack each of them in one go! What about practising them with the mock tests? Explore a wide range of questions in <\/span><a href=\"https:\/\/www.aakash.ac.in\/neet-mock-tests\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">NEET mock tests<\/span><\/a><span style=\"font-weight: 400;\">, <\/span><a href=\"https:\/\/byjus.com\/jee-mock-test\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">JEE mock tests<\/span><\/a><span style=\"font-weight: 400;\"> and <\/span><a href=\"https:\/\/www.aakash.ac.in\/cucet-preparation\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">CUCET preparation<\/span><\/a><span style=\"font-weight: 400;\">, and boost your problem-solving skills.\u00a0<\/span><\/p>\n<h2>FAQs<\/h2>\n\t\t<div class=\"wp-faq-schema-wrap\">\n\t\t\t\t\t\t<div class=\"wp-faq-schema-items\">\n\t\t\t\t\t\t\t\t\t<h3>1. What was the John Dalton theory?<\/h3>\n\t\t\t\t\t<div class=\"\">\n\t\t\t\t\t\t<p>John Dalton's theory states that all kinds of matter around us are made up of several atoms, and one matter might be made up of two or more different kinds of them. These atoms are considered to be inseparable. Next, John Dalton rightly claims that all the atoms that make up a particular form of matter are identical in mass and properties. He also claimed in his theory that a chemical reaction is simply the rearrangement of the atoms of a particular matter.<\/p>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<h3>2. What was the main reason behind the failure of Dalton&#039;s atomic theory?<\/h3>\n\t\t\t\t\t<div class=\"\">\n\t\t\t\t\t\t<p>The primary reason behind the failure of Dalton's atomic theory was the claim that atoms are indivisible. By declaring atoms indivisible, Dalton meant that there was no component inside atoms, and it could be broken down no further. However, the discovery of electrons and neutrons proved that atoms are, in fact, not indivisible. They are made up of components too, and hence are not the minor units known in the world. Hence, Dalton's theory is not 100% accurate.<\/p>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<h3>3. Why does an electron have a negative charge?<\/h3>\n\t\t\t\t\t<div class=\"\">\n\t\t\t\t\t\t<p>Electrons are considered to have a negative charge because of their fixed behaviour in an electric field. Whenever there is a magnet, there exists a magnetic field. Within this field, the charges flow in a fixed convention. Since the electrons are seen to move on a fixed pathway \u2013 from the negative pole to the positive pole\u2013they have a negative charge. They also attract the protons, which happen to be the opposite of the negative, i.e., positive charge. Hence, they are termed negatively charged ions.<\/p>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<h3>4. How much does a proton weigh?<\/h3>\n\t\t\t\t\t<div class=\"\">\n\t\t\t\t\t\t<p>Compare it to the weight and size of electrons.  Protons are the positively charged ions of an atom and have a mass of 1.67 * 10-27 kg. This mass has been calculated when the protons have been at rest. Compared to electrons, the mass of a proton is nearly about 1,836 times heavier than that of the electrons.<\/p>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<h3>5. Why do neutrons have no charge?<\/h3>\n\t\t\t\t\t<div class=\"\">\n\t\t\t\t\t\t<p>Neutrons are made up of components called quarks. There are two types of quarks in a neutron \u2013 up quark and down quark. In the natural component of an atom, there are two down quarks and one up quark. The value of one up quark is +2\/3, and the two down quarks are about -1\/3 each. Adding up, +2\/3+(-1\/3-1\/3) = 0. Hence, the charge of a neutron is 0, i.e., neutral.<\/p>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\n","protected":false},"excerpt":{"rendered":"<p>Did you ever find yourself wondering \u2013 what are particles? This question is undoubtedly exciting yet confusing as its answer might twist your head and leave you confused. The beauty of the definition of particles lies within the wide variety of opinions on the topic. A particle, in simpler terms, can be defined as a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":142204,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[2913,2915,2914],"class_list":["post-142111","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-board-exams","tag-electrons","tag-neutrons","tag-protons"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Who discovered Electrons, Protons and Neutrons?<\/title>\n<meta name=\"description\" content=\"It&#039;s important to know about protons and Neutrons to clear your exam.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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