Question

how do atomic size and metallic character of element vary as we go down a group and across a period

Answer 1

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$down \: the \: group \: = >$
The atomic size of elements increases due to addition of new valence shells.
Also, metallic property / character increases down the group.

This is due to the fact that while moving down the group ionic radii increases so tendency to loose electrons is increased and hence they form Cation.

$Across \: The \: Period \: => \:$

Across the period tendency of an atom to attract electrons is increased so their atomic size or ionic radius is decreased hence, it's size decreases and they forms an anion.

Due to an increase in nuclear charge it results in a decrease of size of an atom.

Hence, the non-metallic character increases across a period.



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