Question

The electronic configuration of an element is 2, 8, 7:
(a) ) What is the atomic number of this element ?
(b) To which of the following elements is this element chemically similar
N(7), F(9), P(15), Ar(18)
( 2 marks )​

Answer 1

Answer:

The electronic configuration(2,8,7) is of Chlorine.

(a) The atomic number of this element will be: 2+8+7=17

(b) It will be chemically similar to the element F(9) as it also has the same number of valence electrons in its valence shell.

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