Question

Electroic configuartion of an elementis2,8,7 The atomic number of this element is---​

Answer 1

Answer:

17

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Answer 2

$\huge\mathbb\green{2-8-7}$

As the electronic configuration of the given atom is 2,8,7 it is inferred that the atomic number of element is 17 (2+8+7). Thus element with atomic number 17 is Chlorine. Among the options given which includes Nitrogen, Fluorine, Phosphorus and Argon, chlorine is chemically similar to fluorine.