Definitions

atomic number 42

List of elements by atomic number

A table of chemical elements ordered by atomic number and color coded according to type of element. Given is each element's name, element symbol, group and period, Chemical series, and atomic mass (or most stable isotope).

Z
Name
Sym
Period
Group
Chemical series
Mass (g/mol)
1 Hydrogen H 1 1 Nonmetal 1.00794(7)
2 Helium He 1 18 Noble gas 4.002602(2)
3 Lithium Li 2 1 Alkali metal 6.941(2)
4 Beryllium Be 2 2 Alkaline earth metal 9.012182(3)
5 Boron B 2 13 Metalloid 10.811(7)
6 Carbon C 2 14 Nonmetal 12.0107(8)
7 Nitrogen N 2 15 Nonmetal 14.0067(2)
8 Oxygen O 2 16 Nonmetal 15.9994(3)
9 Fluorine F 2 17 Halogen 18.9984032(5)
10 Neon Ne 2 18 Noble gas 20.1797(6)
11 Sodium Na 3 1 Alkali metal 22.98976928(2)
12 Magnesium Mg 3 2 Alkaline earth metal 24.3050(6)
13 Aluminium Al 3 13 Poor metal 26.9815386(8)
14 Silicon Si 3 14 Metalloid 28.0855(3)
15 Phosphorus P 3 15 Nonmetal 30.973762(2)
16 Sulfur S 3 16 Nonmetal 32.065(5)
17 Chlorine Cl 3 17 Halogen 35.453(2)
18 Argon Ar 3 18 Noble gas 39.948(1)
19 Potassium K 4 1 Alkali metal 39.0983(1)
20 Calcium Ca 4 2 Alkaline earth metal 40.078(4)
21 Scandium Sc 4 3 Transition metal 44.955912(6)
22 Titanium Ti 4 4 Transition metal 47.867(1)
23 Vanadium V 4 5 Transition metal 50.9415(1)
24 Chromium Cr 4 6 Transition metal 51.9961(6)
25 Manganese Mn 4 7 Transition metal 54.938045(5)
26 Iron Fe 4 8 Transition metal 55.845(2)
27 Cobalt Co 4 9 Transition metal 58.933195(5)
28 Nickel Ni 4 10 Transition metal 58.6934(4)
29 Copper Cu 4 11 Transition metal 63.546(3)
30 Zinc Zn 4 12 Transition metal 65.38(2)
31 Gallium Ga 4 13 Poor metal 69.723(1)
32 Germanium Ge 4 14 Metalloid 72.64(1)
33 Arsenic As 4 15 Metalloid 74.92160(2)
34 Selenium Se 4 16 Nonmetal 78.96(3)
35 Bromine Br 4 17 Halogen 79.904(1)
36 Krypton Kr 4 18 Noble gas 83.798(2)
37 Rubidium Rb 5 1 Alkali metal 85.4678(3)
38 Strontium Sr 5 2 Alkaline earth metal 87.62(1)
39 Yttrium Y 5 3 Transition metal 88.90585(2)
40 Zirconium Zr 5 4 Transition metal 91.224(2)
41 Niobium Nb 5 5 Transition metal 92.906 38(2)
42 Molybdenum Mo 5 6 Transition metal 95.96(2)
43 Technetium Tc 5 7 Transition metal [98.9063]
44 Ruthenium Ru 5 8 Transition metal 101.07(2)
45 Rhodium Rh 5 9 Transition metal 102.90550(2)
46 Palladium Pd 5 10 Transition metal 106.42(1)
47 Silver Ag 5 11 Transition metal 107.8682(2)
48 Cadmium Cd 5 12 Transition metal 112.411(8)
49 Indium In 5 13 Poor metal 114.818(3)
50 Tin Sn 5 14 Poor metal 118.710(7)
51 Antimony Sb 5 15 Metalloid 121.760(1)
52 Tellurium Te 5 16 Metalloid 127.60(3)
53 Iodine I 5 17 Halogen 126.90447(3)
54 Xenon Xe 5 18 Noble gas 131.293(6)
55 Caesium Cs 6 1 Alkali metal 132.9054519(2)
56 Barium Ba 6 2 Alkaline earth metal 137.327(7)
57 Lanthanum La 6 Lanthanide 138.90547(7)
58 Cerium Ce 6 Lanthanide 140.116(1)
59 Praseodymium Pr 6 Lanthanide 140.90765(2)
60 Neodymium Nd 6 Lanthanide 144.242(3)
61 Promethium Pm 6 Lanthanide [146.9151]
62 Samarium Sm 6 Lanthanide 150.36(2)
63 Europium Eu 6 Lanthanide 151.964(1)
64 Gadolinium Gd 6 Lanthanide 157.25(3)
65 Terbium Tb 6 Lanthanide 158.92535(2)
66 Dysprosium Dy 6 Lanthanide 162.500(1)
67 Holmium Ho 6 Lanthanide 164.93032(2)
68 Erbium Er 6 Lanthanide 167.259(3)
69 Thulium Tm 6 Lanthanide 168.93421(2)
70 Ytterbium Yb 6 Lanthanide 173.054(5)
71 Lutetium Lu 6 3 Lanthanide 174.9668(1)
72 Hafnium Hf 6 4 Transition metal 178.49(2)
73 Tantalum Ta 6 5 Transition metal 180.9479(1)
74 Tungsten W 6 6 Transition metal 183.84(1)
75 Rhenium Re 6 7 Transition metal 186.207(1)
76 Osmium Os 6 8 Transition metal 190.23(3)
77 Iridium Ir 6 9 Transition metal 192.217(3)
78 Platinum Pt 6 10 Transition metal 195.084(9)
79 Gold Au 6 11 Transition metal 196.966569(4)
80 Mercury Hg 6 12 Transition metal 200.59(2)
81 Thallium Tl 6 13 Poor metal 204.3833(2)
82 Lead Pb 6 14 Poor metal 207.2(1)
83 Bismuth Bi 6 15 Poor metal 208.98040(1)
84 Polonium Po 6 16 Metalloid [208.9824]
85 Astatine At 6 17 Halogen [209.9871]
86 Radon Rn 6 18 Noble gas [222.0176]
87 Francium Fr 7 1 Alkali metal [223.0197]
88 Radium Ra 7 2 Alkaline earth metal [226.0254]
89 Actinium Ac 7 Actinide [227.0278]
90 Thorium Th 7 Actinide 232.03806(2)
91 Protactinium Pa 7 Actinide 231.03588(2)
92 Uranium U 7 Actinide 238.02891(3)
93 Neptunium Np 7 Actinide [237.0482]
94 Plutonium Pu 7 Actinide [244.0642]
95 Americium Am 7 Actinide [243.0614]
96 Curium Cm 7 Actinide [247.0704]
97 Berkelium Bk 7 Actinide [247.0703]
98 Californium Cf 7 Actinide [251.0796]
99 Einsteinium Es 7 Actinide [252.0829]
100 Fermium Fm 7 Actinide [257.0951]
101 Mendelevium Md 7 Actinide [258.0986]
102 Nobelium No 7 Actinide [259.1009]
103 Lawrencium Lr 7 3 Actinide [264]
104 Rutherfordium Rf 7 4 Transition metal [265]
105 Dubnium Db 7 5 Transition metal [268]
106 Seaborgium Sg 7 6 Transition metal [272]
107 Bohrium Bh 7 7 Transition metal [273]
108 Hassium Hs 7 8 Transition metal [276]
109 Meitnerium Mt 7 9 Transition metal [279]
110 Darmstadtium Ds 7 10 Transition metal [278]
111 Roentgenium Rg 7 11 Transition metal [283]
112 Ununbium Uub 7 12 Transition metal [285]
113 Ununtrium Uut 7 13 Poor metal [287]
114 Ununquadium Uuq 7 14 Poor metal [289]
115 Ununpentium Uup 7 15 Poor metal [291]
116 Ununhexium Uuh 7 16 Poor metal [293]
117 Ununseptium Uus 7 17 Halogen [295]
118 Ununoctium Uuo 7 18 Noble gas [294]

Notes

References

  • M. E. Wieser (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure Appl. Chem. 78 (11): 2051-2066. (for atomic weights of elements with atomic numbers from 1-102)
  • M. E. Wieser IUPAC Standard Atomic Weights Revised (2007). IUPAC. (2007). Retrieved on 2008-07-07..
  • Sonzogni, Alejandro Interactive Chart of Nuclides. Brookhaven National Laboratory. Retrieved on 2008-06-06.. (for atomic weights of elements with atomic numbers 103-118)

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