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Kale Eichmann

Feb 20, 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? Enter the numbers in order, from (a) to (d) in the answer boxes. All 4 numbers must be correct. A) 5A(15)B) 4A(14)C) 7A(17)D) 8A(18)
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OK, working through the main groups left to right the outer shell structures will beGroup I A s1 = one unpaired electronGroup 2A s2 = 2 paired electronsGroup 3A s2p1 = 2 paired + 1 unpairedGroup 4A s2p2 = 2 paired + 2 unpairedGroup 5A s2p3 = 2 paired + 3 unpairedGroup 6A s2p4 = 4 paired + 2 unpairedGroup 7A s2p5 = 6 paired + 1 unpairedGroup 8A s2p6 = 8 paired So 5A has 3 unpaired electrons4A has 2 unpaired electrons7A has 1 unpaired electron8A has no unpaired electronsHope 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... Show More
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