Question

In atom has electronic configuration 2,8,7.

(a) What is the atomic number of this element?

(b) To which of the following Elements would it be chemically similar

(atomic numbers are given in parenthesis)

N(7). F(9). P(15). Ar(18)​

Answer 1

Explanation:

The atomic number of this element can be obtained by adding all the electrons present in its electronic configuration. So the atomic number of the given element having electronic configuration 2, 8,5 is 2+8+7=17.

Answer 2

Answer:

First of all by seeing the configuration I can say that the atom is of Chlorine (Cl)

1) the atomic number of Cl is 17

2) it would be similar to the Element Flourine

as :

1- they both lie in same group of periodic table

I. e . group - 17

2- both of them have the same outer electronic configuration i.e. - 7

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