Question

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Answer 1

Answer:

When we move left to right in a period no. of valence electrons increase

When we move down a group the no. of valence electrons remain same but the no. of shell goes on increasing..

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Answer 2

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On moving from left to right in a period, the chemical reactivity of elements first decreases and then increases. On moving from left to right in a period, the number of valence electrons increases from 1 to 8.

As we move from top to bottom in a group, the number of valence electrons remains same because a group is defined such that their valence shell configuration is same. Hence, valence electrons remain same but valence shell changes.

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