Question

please give me the answer ​

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

here is your answer

Explanation:

a)valence electrons

valence electrons increase as we go across a period whereas valence electrons remain constant/same as we go down a group.

b)valency

valency increases as we go across a period whereas it remains the same as we go down the group.

c)atomic size

atomic size  decreases as we go across the period because the no. of valence electrons increase and the no. of shells are constant so collectively the nuclear force holding the atom increases whereas we we go down the group the no. of shells increases and so the atomic size increases,

d)no. of shells

no. of shells increases as we go down the group whereas the no. of shells remain constant as we move across a period.