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bhargav
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Asked: 2021-07-09T05:55:09+00:00 In:

Write the number of periods the Modern Periodic Table has. State the changes in valency and metallic character of elements as we move from left to right in a period. Also state the changes, if any, in the valency and atomic size of elements as we move down a group

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      . No. of periods: 7
      . Valency across a period increases from 1 to 4, then decreases from 4 to zero.
      . Metallic character of elements across a period decreases.
      . Valency down a group remains the same.
      . Atomic size of elements down a group increases.

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