Question

an element X has atomic number 9 and Y has 17
(I) In which period it will be placed
(ii) Which one having the largest atomic radii
(iii) Is there is any similarity between these​

Answer 1

Answer:

Electonic configuration: X 2, 7

Y : 2,8,7

1. X in period 2 and Y in 3 becoz of no. Of shells.

2. Element Y becoz of one more shell.

3. Yes there valancy is the same and they belong to same group thai is halogens.

Explanation:

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Answer 2

Explanation:

1. atm. no. element will be placed in 2nd period and Y element will be placed in 3 rd period.
2. Y
3. yes there valence electron is -1