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Write the number of period the modern periodic table has how do the valency and metallic character of elements vary moving from left to right in a period how do the valency and atomic size of the elements vary down a group?

Posted by Anjali Yadav 5 years ago

CBSE > Class 10 > Science

2 answers

Kiran Kumari 5 years ago

There are seven periods in modern periodic table. As we move from left to right in a period valecy increases from 1 to 4 and then decreases to 0. When we move from left to right in a period metallic character of elements decreases and non- metallic character started to increase. As we go down in a group valecy of element remain same and atomic size start increase

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Yogita Ingle 5 years ago

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The modern periodic table has seven periods.

On moving from left to right in the periodic table, the metallic character of elements decreases, while the valency first increases from 1 to 4 and then decreases to 0 (zero). On moving down the group, the atomic size of the elements increases, but the valency remains the same.

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