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Given below is a part of the periodic table. How does the valency vary, as we move vertically downward from Li to Fr. Give reason.

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Given below is a part of the periodic table. How does the valency vary, as we move vertically downward from Li to Fr. Give reason.

Li Be
Na
K
Rb
Cs
Fr Ra

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Valency remains constant as we move downwards. Elements of the same group have the same number of valence electrons.

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