Question 5 (a)
An atom has electronic configuration 2, 8, 7.
What is the atomic number of this element?

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Solution

The atomic number of this element is 17. Atomic number is the sum of all the valence electrons in an atom. It is 2 + 8 + 7 = 17.

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Similar questions

An 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 parentheses.)

N(7) F(9) P(15) Ar(18)

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