Question

An atom has the electron structure of 2, 7.
(a) What is the atomic number of this atom?
(b) To which of the following would it be chemically similar?
7N, 15P, 17Cl, 18Ar
(c) Why would you expect it to be similar?

Answer 1

Answer:

1. 9
2. 17Cl
3. Because both have valency 1.

Answer 2

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❀ 9

❀ 17CI

❀ Because both have valency 1