Write electronic configuration of Cl-(Z=17),Cu^2+(Z=29),Cr^3+(Z=24)
Answers
Electron shells filled in violation of Madelung's rule[21] (red)
Period 4 Period 5 Period 6 Period 7
Element Z Electron Configuration Element Z Electron Configuration Element Z Electron Configuration Element Z Electron Configuration
Lanthanum 57 [Xe] 6s2 5d1 Actinium 89 [Rn] 7s2 6d1
Cerium 58 [Xe] 6s2 4f1 5d1 Thorium 90 [Rn] 7s2 6d2
Praseodymium 59 [Xe] 6s2 4f3 Protactinium 91 [Rn] 7s2 5f2 6d1
Neodymium 60 [Xe] 6s2 4f4 Uranium 92 [Rn] 7s2 5f3 6d1
Promethium 61 [Xe] 6s2 4f5 Neptunium 93 [Rn] 7s2 5f4 6d1
Samarium 62 [Xe] 6s2 4f6 Plutonium 94 [Rn] 7s2 5f6
Europium 63 [Xe] 6s2 4f7 Americium 95 [Rn] 7s2 5f7
Gadolinium 64 [Xe] 6s2 4f7 5d1 Curium 96 [Rn] 7s2 5f7 6d1
Terbium 65 [Xe] 6s2 4f9 Berkelium 97 [Rn] 7s2 5f9
Scandium 21 [Ar] 4s2 3d1 Yttrium 39 [Kr] 5s2 4d1 Lutetium 71 [Xe] 6s2 4f14 5d1 Lawrencium 103 [Rn] 7s2 5f14 7p1
Titanium 22 [Ar] 4s2 3d2 Zirconium 40 [Kr] 5s2 4d2 Hafnium 72 [Xe] 6s2 4f14 5d2 Rutherfordium 104 [Rn] 7s2 5f14 6d2
Vanadium 23 [Ar] 4s2 3d3 Niobium 41 [Kr] 5s1 4d4 Tantalum 73 [Xe] 6s2 4f14 5d3 Dubnium 105 [Rn] 7s2 5f14 6d3
Chromium 24 [Ar] 4s1 3d5 Molybdenum 42 [Kr] 5s1 4d5 Tungsten 74 [Xe] 6s2 4f14 5d4 Seaborgium 106 [Rn] 7s2 5f14 6d4
Manganese 25 [Ar] 4s2 3d5 Technetium 43 [Kr] 5s2 4d5 Rhenium 75 [Xe] 6s2 4f14 5d5 Bohrium 107 [Rn] 7s2 5f14 6d5
Iron 26 [Ar] 4s2 3d6 Ruthenium 44 [Kr] 5s1 4d7 Osmium 76 [Xe] 6s2 4f14 5d6 Hassium 108 [Rn] 7s2 5f14 6d6
Cobalt 27 [Ar] 4s2 3d7 Rhodium 45 [Kr] 5s1 4d8 Iridium 77 [Xe] 6s2 4f14 5d7
Nickel 28 [Ar] 4s2 3d8 or
[Ar] 4s1 3d9 (disputed)[22] Palladium 46 [Kr] 4d10 Platinum 78 [Xe] 6s1 4f14 5d9
Copper 29 [Ar] 4s1 3d10 Silver 47 [Kr] 5s1 4d10 Gold 79 [Xe] 6s1 4f14 5d10
Zinc 30 [Ar] 4s2 3d10 Cadmium 48 [Kr] 5s2 4d10 Mercury 80 [Xe] 6s2 4f14 5d10
remember that 4s fills before 3d
but since 4s is the last shell so first it will loose the electrons
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