Question

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Answer 1

I) Krypton. iii)2-8-9. family=alkali metals. iv) because it is a stable gas ,it does not loose or gain electron. ii)18th group and 4th period

Answer 2

(K - potassium) the electronic configuration of K is wrong there the correct is 2,8,8,1
in modern periodic table krypton lies in group 18 and period 4
the general e.c. of K is 2,8,8,1 and it belongs to the family of alkali metals
helium has some or the other similarity with the halogen of group 18 hence it is placed there
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