Question

Q5) Teacher wrote the electronic configuration of an atom of an element as 2, 8, 7. What is the atomic number of this
element?
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Answer 1

So the atomic number of the given elementhaving electronic configuration 2, 8,5 is2+8+7=17.....answers

Answer 2

Explanation:

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.

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