Atomic Structure and Physical Properties of Period 3 Elements

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Period 3 elements are a group of 8 elements starting from Sodium in the modern periodic table.

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The 8 elements are sodium, magnesium, aluminium, silicon, phosphorus, sulphur, chlorine and argon.

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All these elements have the valence electrons of each atom in the 3-level. Hence the name.

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See how the period 3 elements are located in the periodic table below

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Sodium, magnesium and aluminium have structures like metals.

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The atomic structure of silicon is giant covalent.

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Electrical conductivity

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Period 3 elements have repeated patterns in chemical and physical properties which is known as ‘Periodicity’.

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Atomic radii of period 3 elements decrease across the periodic table.

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The number of protons increases from left to right across period 3 elements.

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The conductivity of period 3 elements increases as you go from sodium to magnesium to aluminium.

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The nucleus & the valence electrons have a stronger electrostatic attraction between them.

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Share the above points with your friends as these can help in revision of period 3 elements.

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