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Anonymous

Jan 29, 2025

Number of Unpaired Electrons in Groups?

How many unpaired electrons are present in the ground state of an atom from each of the following groups? Please enter the numbers in order, from (a) to (d), in the answer boxes provided. All four numbers must be correct.

(a) Group 5A (15)
(b) Group 4A (14)
(c) Group 7A (17)
(d) Group 8A (18)

1 Answers

OK, working through the main groups left to right the outer shell structures will be

Group I A s1 = one unpaired electron

Group 2A s2 = 2 paired electrons

Group 3A s2p1 = 2 paired + 1 unpaired

Group 4A s2p2 = 2 paired + 2 unpaired

Group 5A s2p3 = 2 paired + 3 unpaired

Group 6A s2p4 = 4 paired + 2 unpaired

Group 7A s2p5 = 6 paired + 1 unpaired

Group 8A s2p6 = 8 paired

So

5A has 3 unpaired electrons

4A has 2 unpaired electrons

7A has 1 unpaired electron

8A has no unpaired electrons

Hope this is clear. Electrons fill the three p orbitals singly before any pairing takes place which explains the outer shell structure for groups 4A, 5A and 6A

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