The following questions are on electrons and electron configuration, it may be useful to review the associated material.
6s
6p
5f
4f
Iron
Zinc
Aluminum
Copper
Silicon
Selenium
Silver
Sulfur
Aluminum
Sodium
Boron
Silicon
Iodine
Bromine
Zinc
Lead
(Kr)4s1
(Kr)3s1
(Ar)4s1
(Ar)3s1
(Ar)2s2 2p5
(Ne)2s2 2p5
(Ar)3s2 3p5
(Ne)3s2 3p5
(Kr)5s2 4d3
(Kr)5s2 4d5
(Ar)4s2 4d6
(Ar)5s2 4d3
18
30
15
6
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