Question

The electronic configuration of an element is 2, 8, 18, 7. It belongs to _______ group

A)14

B)18

C)17

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Answer 1

Answer:

A) 17

It belongs to group 17 as the outermost electrons of the element indicate so.

Group

$= x + 10$

where x is the outermost electrons of the element and x>2