Question

An element has electronic arrangement is 2,8,7

1 . Write it's atomic no.and name
2. Out of the following element which element has same chemical properties
N (7),F (9),P (15),Ar(18)

Answer 1

1. Atomic no =17
Atomic name = chlorine

Answer 2

1)atomicno.17 name:chlorine
2)N and P becoz both has valence electron as 5
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