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Electron & Shell Configuration


Radioactive Material Sign
Radioactive Natural Element		 Radioactive Material Sign
Radioactive Synthetic Element		 Toxic Material Sign
Toxic Element
Name Sym. Atomic
Number		 Electrons per Shell Electron Configuration Valence
Electrons		 Oxidation
States
Hydrogen H 1 1 1s1 1s1 1, -1
(amphoteric oxide)
Helium He 2 2 1s2 1s2 0
Lithium Li 3 2, 1 1s2 2s1 2s1 +1 (strongly basic oxide)
Beryllium Toxic Element Be 4 2, 2 1s2 2s2 2s2 +2 (amphoteric oxide)
Boron Toxic Element B 5 2, 3 1s2 2s2 2p1 2s2 2p1 +3,
(mildly acidic oxide)
Carbon C 6 2, 4 1s2 2s2 2p2 2s2 2p2 +4, -4, +2
(mildly acidic oxide)
Nitrogen N 7 2, 5 1s2 2s2 2p3 2s2 2p3 ±3, +5, +4, -2
(strongly acidic oxide)
Oxygen O 8 2, 6 1s2 2s2 2p4 2s2 2p4 -2, -1
(neutral oxide)
Fluorine Toxic Element F 9 2, 7 1s2 2s2 2p5 2s22p5 -1 (strongly acidic oxide)
Neon Ne 10 2, 8 1s2 2s2 2p6 2s22p6 0
Sodium Na 11 2, 8, 1 [Ne] 3s1 3s1 +1 (strongly basic oxide)
Magnesium Mg 12 2, 8, 2 [Ne] 3s2 3s2 +2 (strongly basic oxide)
Aluminum Toxic Element Al 13 2, 8, 3 [Ne] 3s2 3p1 3s2 3p1 +3
(amphoteric oxide)
Silicon Si 14 2, 8, 4 [Ne] 3s2 3p2 3s2 3p2 +4,-4, +2
(amphoteric oxide)
Phosphorus Toxic Element P 15 2, 8, 5 [Ne] 3s2 3p3 3s2 3p3 ±3, +5, +4
(mildly acidic oxide)
Sulfur S 16 2, 8, 6 [Ne] 3s2 3p4 3s2 3p4 -1, ±2, +4, 6
(strongly acidic oxide)
Chlorine Toxic Element Cl 17 2, 8, 7 [Ne] 3s2 3p5 3s23p5 ±1, 3, 5, 7
(strongly acidic oxide)
Argon Ar 18 2, 8, 8 [Ne] 3s2 3p6 2s22p6 0
Potassium K 19 2, 8, 8, 1 [Ar] 4s1 4s1 +1 (strongly basic oxide)
Calcium Ca 20 2, 8, 8, 2 [Ar] 4s2 4s2 +2 (strongly basic oxide)
Scandium Sc 21 2, 8, 9, 2 [Ar] 3d1 4s2 3d14s2 +3
(weakly basic oxide)
Titanium Ti 22 2, 8, 10, 2 [Ar] 3d2 4s2 3d24s2 +2, +3, +4
(amphoteric oxide)
Vanadium Toxic Element V 23 2, 8, 11, 2 [Ar] 3d3 4s2 3d34s2 +2,+3,+4,+5
(amphoteric oxide)
Chromium Toxic Element Cr 24 2, 8, 13, 1 [Ar] 3d5 4s1 3d54s1 +2,+3,+6
(strongly acidic oxide)
Manganese Toxic Element Mn 25 2, 8, 13, 2 [Ar] 3d5 4s2 3d54s2 +2,+3,+4,+7
(strongly acidic oxide)
Iron Fe 26 2, 8, 14, 2 [Ar] 3d6 4s2 3d64s2 +2,+3, +4, +6
(amphoteric oxide)
Cobalt Co 27 2, 8, 15, 2 [Ar] 3d7 4s2 3d74s2 +2,+3
(amphoteric oxide)
Nickel Toxic Element Ni 28 2, 8, 16, 2 [Ar] 4s2 3d8 3d84s2 +2,+3
(mildly basic oxide)
Copper Toxic Element Cu 29 2, 8, 18, 1 [Ar] 3d10 4s1 3d104s1 +1,+2
(mildly basic oxide)
Zinc Toxic Element Zn 30 2, 8, 18, 2 [Ar] 3d10 4s2 4s2 +2
(amphoteric oxide)
Gallium Ga 31 2, 8, 18, 3 [Ar] 3d10 4s2 4p1 4s2 4p1 +3, +1
(amphoteric oxide)
Germanium Ge 32 2, 8, 18, 4 [Ar] 3d10 4s2 4p2 4s2 4p2 +2, -2, +4
(amphoteric oxide)
Arsenic Toxic Element As 33 2, 8, 18, 5 [Ar] 3d10 4s2 4p3 4s2 4p3 ±3, 5
(mildly acidic oxide)
Selenium Toxic Element Se 34 2, 8, 18, 6 [Ar] 3d10 4s2 4p4 4s2 4p4 ±2, +4, +6
(strongly acidic oxide)
Bromine Toxic Element Br 35 2, 8, 8, 10, 7 [Ar] 3d10 4s2 4p5 4s24p5 ±1, 5
(strongly acidic oxide)
Krypton Kr 36 2, 8, 18, 8 [Ar] 3d10 4s2 4p6 4s24p6 +2
Rubidium Rb 37 2, 8, 18, 8, 1 [Kr] 5s1 5s1 +1 (strongly basic oxide)
Strontium Toxic Element Sr 38 2, 8, 18, 8, 2 [Kr] 5s2 5s2 +2 (strongly basic oxide)
Yttrium Y 39 2, 8, 18, 9, 2 [Kr] 4d1 5s2 4d15s2 +3
(weakly basic oxide)
Zirconium Zr 40 2, 8, 18, 10, 2 [Kr] 4d2 5s2 4d25s2 +4
(amphoteric oxide)
Niobium Nb 41 2, 8, 18, 12, 1 [Kr] 4d4 5s1 4d45s1 +3,+5
(mildly acidic oxide)
Molybdenum Mo 42 2, 8, 18, 13, 1 [Kr] 4d5 5s1 4d55s1 +4, +6
(strongly acidic oxide)
Technetium Radioactive Synthetic Element Tc 43 2, 8, 18, 13, 2 [Kr] 4d5 5s2 4d55s2 +4,+6,+7
(strongly acidic oxide)
Ruthenium Ru 44 2, 8, 18, 15, 1 [Kr] 4d7 5s1 4d75s1 +2, +3, +4, +6, +8
(mildly acidic oxide)
Rhodium Rh 45 2, 8, 18, 16, 1 [Kr] 4d8 5s1 4d85s1 +2, +3, +4
(amphoteric oxide)
Palladium Pd 46 2, 8, 18, 18, 0 [Kr] 4d10 4d10 +2, +3, +4
(mildly basic oxide)
Silver Toxic Element Ag 47 2, 8, 18, 18, 1 [Kr] 4d10 5s1 5s1 +1
(amphoteric oxide)
Cadmium Toxic Element Cd 48 2, 8, 18, 18, 2 [Kr] 4d10 5s2 5s2 +2
(mildly basic oxide)
Indium In 49 2, 8, 18, 18, 3 [Kr] 4d10 5s2 5p1 5s2 5p1 +3
(amphoteric oxide)
Tin Sn 50 2, 8, 18, 18, 4 [Kr] 4d10 5s2 5p2 5s2 5p2 +2,+4
(amphoteric oxide)
Antimony Toxic Element Sb 51 2, 8, 18, 18, 5 [Kr] 4d10 5s2 5p3 5s2 5p3 -3, +3, 5
Tellurium Te 52 2, 8, 18, 18, 6 [Kr] 4d10 5s2 5p4 5s2 5p4 ±2, 4, 6
(mildly acidic oxide)
Iodine Toxic Element I 53 2, 8, 18, 18, 7 [Kr] 4d10 5s2 5p5 5s25p5 ±1, 5, 7
(strongly acidic oxide)
Xenon Xe 54 2, 8, 18, 18, 8 [Kr] 4d10 5s2 5p6 5s25p6 rarely more than 0
Cesium Cs 55 2, 8, 18, 18, 8, 1 [Xe] 6s1 6s1 +1 (strongly basic oxide)
Barium Toxic Element Ba 56 2, 8, 18, 18, 8, 2 [Xe] 6s2 6s2 +2 (strongly basic oxide)
Lanthanum La 57 2, 8, 18, 18, 9, 2 [Xe] 5d1 6s2 5d16s2 +3
(strongly basic oxide)
Cerium Ce 58 2, 8, 18, 19, 9, 2 [Xe] 4f1 5d1 6s2 4f15d16s2 +3,+4
(mildly basic oxide)
Praseodymium Pr 59 2, 8, 18, 21, 8, 2 [Xe] 4f3 6s2 4f36s2 +3
(mildly basic oxide)
Neodymium Nd 60 2, 8, 18, 22, 8, 2 [Xe] 4f4 6s2 4f46s2 +3
(mildly basic oxide)
Promethium Radioactive Synthetic Element Pm 61 2, 8, 18, 23, 8, 2 [Xe] 4f5 6s2 4f56s2 +3
(mildly basic oxide)
Samarium Sm 62 2, 8, 18, 24, 8, 2 [Xe] 4f6 6s2 4f66s2 +2,+3
(mildly basic oxide)
Europium Eu 63 2, 8, 18, 25, 8, 2 [Xe] 4f7 6s2 4f76s2 +2,+3
(mildly basic oxide)
Gadolinium Gd 64 2, 8, 18, 25, 9, 2 [Xe] 4f7 5d1 6s2 4f7 5d16s2 +3
(mildly basic oxide)
Terbium Tb 65 2, 8, 18, 27, 8, 2 [Xe] 4f9 6s2 4f96s2 +3
(weakly basic oxide)
Dysprosium Dy 66 2, 8, 18, 28, 8, 2 [Xe] 4f10 6s2 4f106s2 +3
(weakly basic oxide)
Holmium Ho 67 2, 8, 18, 29, 8, 2 [Xe] 4f11 6s2 4f116s2 +3
(basic oxide)
Erbium Er 68 2, 8, 18, 30, 8, 2 [Xe] 4f12 6s2 4f126s2 +3
(basic oxide)
Thulium Tm 69 2, 8, 18, 31, 8, 2 [Xe] 4f13 6s2 4f136s2 +3
(basic oxide)
Ytterbium Yb 70 2, 8, 18, 32, 8, 2 [Xe] 4f14 6s2 4f146s2 +2,+3
(basic oxide)
Lutetium Lu 71 2, 8, 18, 32, 9, 2 [Xe] 4f14 5d1 6s2 5d16s2 +3
(weakly basic oxide)
Hafnium Hf 72 2, 8, 18, 32, 10, 2 [Xe] 4f14 5d2 6s2 5d26s2 +4
(amphoteric oxide)
Tantalum Ta 73 2, 8, 18, 32, 11, 2 [Xe] 4f14 5d3 6s2 5d36s2 +5 (mildly acidic oxide)
Tungsten W 74 2, 8, 18, 32, 12, 2 [Xe] 4f14 5d4 6s2 5d46s2 +4, +6
(mildly acidic oxide)
Rhenium Re 75 2, 8, 18, 32, 13, 2 [Xe] 4f14 5d5 6s2 5d56s2 +4,+6,+7
(mildly acidic oxide)
Osmium Os 76 2, 8, 18, 32, 14, 2 [Xe] 4f14 5d6 6s2 5d66s2 +3,+4
(mildly acidic oxide)
Iridium Ir 77 2, 8, 18, 32, 15, 2 [Xe] 4f14 5d7 6s2 5d76s2 +3,+4
(mildly basic oxide)
Platinum Pt 78 2, 8, 18, 32, 17, 1 [Xe] 4f14 5d9 6s1 5d96s1 +2,+4
(mildly basic oxide)
Gold Au 79 2, 8, 18, 32, 18, 1 [Xe] 4f14 5d10 6s1 5d106s1 +1,+3
(amphoteric oxide)
Mercury Toxic Element Hg 80 2, 8, 18, 32, 18, 2 [Xe] 4f14 5d10 6s2 6s2 +1,+2
(mildly basic oxide)
Thallium Toxic Element Tl 81 2, 8, 18, 32, 18, 3 [Xe] 4f14 5d10 6s2 6p1 6s2 6p1 +1,+3
(mildly basic oxide)
Lead Toxic Element Pb 82 2, 8, 18, 32, 18, 4 [Xe] 4f14 5d10 6s2 6p2 6s2 6p2 +2,+4
(amphoteric oxide)
Bismuth Bi 83 2, 8, 18, 32, 18, 5 [Xe] 4f14 5d10 6s2 6p3 6s2 6p3 +3,+5
(mildly acidic oxide)
Polonium Radioactive Natural Element Toxic Element Po 84 2, 8, 18, 32, 18, 6 [Xe] 4f14 5d10 6s2 6p4 6s2 6p4 +4, +2, -2
(amphoteric oxide)
Astatine Radioactive Synthetic Element At 85 2, 8, 18, 32, 18, 7 [Xe] 4f14 5d10 6s2 6p5 6s26p5 ±1, 3, 5, 7
Radon Radioactive Natural Element Toxic Element Rn 86 2, 8, 18, 32, 18, 8 [Xe] 4f14 5d10 6s2 6p6 6s26p6 0
Francium Radioactive Natural Element Fr 87 2, 8, 18, 32, 18, 8, 1 [Rn] 7s1 7s1 +1 (strongly basic oxide)
Radium Radioactive Natural Element Toxic Element Ra 88 2, 8, 18, 32, 18, 8, 2 [Rn] 7s2 7s2 +2 (strongly basic oxide)
Actinium Radioactive Natural Element Ac 89 2, 8, 18, 32, 18, 9, 2 [Rn] 6d1 7s2 6d17s2 +3(neutral oxide)
Thorium Radioactive Natural Element Toxic Element Th 90 2, 8, 18, 32, 18, 10, 2 [Rn] 6d2 7s2 6d27s2 +4
(weakly basic oxide)
Protactinium Radioactive Synthetic Element Pa 91 2, 8, 18, 32, 20, 9, 2 [Rn] 5f2 6d1 7s2 5f26d17s2 +5,+4
(weakly basic oxide)
Uranium Radioactive Natural Element Toxic Element U 92 2, 8, 18, 32, 21, 9, 2 [Rn] 5f3 6d1 7s2 5f36d17s2 +3,+4,+5,+6
(weakly basic oxide)
Transuranium Elements
Neptunium Radioactive Natural Element Toxic Element Np 93 2, 8, 18, 32, 22, 9, 2 [Rn] 5f4 6d1 7s2 5f46d17s2 +3,+4,+5,+6
(amphoteric oxide)
Plutonium Radioactive Natural Element Toxic Element Pu 94 2, 8, 18, 32, 24, 8, 2 [Rn] 5f6 7s2 5f67s2 +3,+4,+5,+6
(amphoteric oxide)
Americium Radioactive Synthetic Element Toxic Element Am 95 2, 8, 18, 32, 25, 8, 2 [Rn] 5f7 7s2 5f77s2 +3,+4,+5,+6
(amphoteric oxide)
Curium Radioactive Synthetic Element Cm 96 2, 8, 18, 32, 25, 9, 2 [Rn] 5f7 6d1 7s2 5f76d17s2 +3
(amphoteric oxide)
Berkelium Radioactive Synthetic Element Bk 97 2, 8, 18, 32, 27, 8, 2 [Rn] 5f9 7s2 5f97s2 +3,+4
Californium Radioactive Synthetic Element Cf 98 2, 8, 18, 32, 28, 8, 2 [Rn] 5f10 7s2 5f107s2 +3
Einsteinium Radioactive Synthetic Element Es 99 2, 8, 18, 32, 29, 8, 2 [Rn] 5f11 7s2 5f117s2 +3
Fermium Radioactive Synthetic Element Fm 100 2, 8, 18, 32, 30, 8, 2 [Rn] 5f12 7s2 5f127s2 +3
Mendelevium Radioactive Synthetic Element Md 101 2, 8, 18, 32, 31, 8, 2 [Rn] 5f13 7s2 5f137s2 +2,+3
Nobelium Radioactive Synthetic Element No 102 2, 8, 18, 32, 32, 8, 2 [Rn] 5f14 7s2 5f147s2 +2,+3
Lawrencium Radioactive Synthetic Element Lr 103 2, 8, 18, 32, 32, 8, 3 ? [Rn] 5f14 7s2 7p1
 ? 7s2 7p1 +3
Rutherfordium Radioactive Synthetic Element Rf 104 2, 8, 18, 32, 32, 10, 2 ? [Rn] 5f14 6d2 7s2
based on hafnium		 ? 6d27s2 ? +4
Dubnium Radioactive Synthetic Element Db 105 2, 8, 18, 32, 32, 11, 2 ? [Rn] 5f14 6d3 7s2
based on tantalum		 ? 6d37s2 Unknown
Seaborgium Radioactive Synthetic Element Sg 106 2, 8, 18, 32, 32, 12, 2 ? [Rn] 5f14 6d4 7s2
based on tungsten		 ? 6d47s2 Unknown
Bohrium Radioactive Synthetic Element Bh 107 2, 8, 18, 32, 32, 13, 2 ? [Rn] 5f14 6d5 7s2
based on rhenium		 ? 6d57s2 Unknown
Hassium Radioactive Synthetic Element Hs 108 2, 8, 18, 32, 32, 14, 2 ? [Rn] 5f14 6d6 7s2
based on osmium		 ? 6d67s2 Unknown
Meitnerium Radioactive Synthetic Element Mt 109 2, 8, 18, 32, 32, 15, 2 ? [Rn] 5f14 6d7 7s2
based on iridium		 ? 6d77s2 Unknown
Darmstadtium Radioactive Synthetic Element Ds 110 2, 8, 18, 32, 32, 17, 1 ? [Rn] 5f14 6d9 7s1
based on platinum		 ? 6d97s1 Unknown
Roentgenium Radioactive Synthetic Element Rg 111 2, 8, 18, 32, 32, 18, 1 ? [Rn] 5f14 6d10 7s1
based on gold		 ? 6d107s1 Unknown
Copernicium Radioactive Synthetic Element Uub 112 2, 8, 18, 32, 32, 18, 2 ? [Rn] 5f14 6d10 7s2
based on mercury		 ? 6d107s2 2, 4
Ununtrium Radioactive Synthetic Element Uut 113 2, 8, 18, 32, 32, 18, 3 ? [Rn] 5f14 6d10 7s2 7p1
based on thallium		 ? 7s2 7p1 Unknown
Ununquadium Radioactive Synthetic Element Uuq 114 2, 8, 18, 32, 32, 18, 4 ? [Rn] 5f14 6d10 7s2 7p2
based on lead		 ? 7s27p2 Unknown
Ununpentium Radioactive Synthetic Element Uup 115 2, 8, 18, 32, 32, 18, 5 ? [Rn] 5f14 6d10 7s2 7p3
based on bismuth		 ? 7s2 7p3 Unknown
Ununhexium Radioactive Synthetic Element Uuh 116 2, 8, 18, 32, 32, 18, 6 ? [Rn] 5f14 6d10 7s2 7p4
based on polonium		 ? 7s27p4 Unknown
Ununseptium Radioactive Synthetic Element
 Uus 117 2, 8, 18, 32, 32, 18, 7 ? [Rn] 5f14 6d10 7s2 7p5
based on astatine		 7s27p5 N/A
Ununoctium Radioactive Synthetic Element Uuo 118 2, 8, 18, 32, 32, 18, 8 ? [Rn] 5f14 6d10 7s2 7p6
based on radon		 7s27p6 ? 0


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