BY Team Aakash Byju's

Periodic Table Groups and Periods Explain:

CBSE Chemistry

Periodic Table of Elements

It is a tabular arrangement of chemical elements. It is also called the periodic table of elements.

Modern Periodic Law

The modern periodic table is arranged based on the modern periodic law.

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The arrangement of chemical elements in increasing order of their atomic number is called the modern periodic law.

Periodic Table Groups

There are 18 vertical columns in the periodic table. These are known as groups.

Periodic Table Periods

There are 7 horizontal rows in a periodic table. These are known as periods.

As the electron configuration changes along the period, the chemical properties also change.

The metallic character of elements decreases from left to right.

The atomic size of the elements in a period decreases from left to right.

 In a period, the valence electrons of elements occupy the same shell.

Each element in a group has the same valence electrons.

All the elements of a group have similar properties. All the elements of a group show similar reactivity.