Chemical Elements 118

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Element ▼ Symbol Atomic number Chemical property Origin o the name Group Period Atomic weight (u)
Californium Cf 98 Actinide California, where the element was first synthesized 7
Calcium Ca 20 Alkaline earth metal the Latin calx, 'lime' 2 4 40.078
Caesium Cs 55 Alkali metal the Latin caesius, 'sky blue' 1 6 132.905452
Cadmium Cd 48 Post-​transition metal the New Latin cadmia, from King Kadmos 12 5 112.414
Bromine Br 35 Reactive nonmetal the Greek bromos, 'stench' 17 4 79.904
Boron B 5 Metalloid borax, a mineral 13 2 10.81
Bohrium Bh 107 Transition metal Niels Bohr, physicist 7 7
Bismuth Bi 83 Post-​transition metal Uncertain, possibly Arabic or German 15 6 208.9804
Beryllium Be 4 Alkaline earth metal beryl, a mineral 2 2 9.012183
Berkelium Bk 97 Actinide Berkeley, California, where the element was first synthesized, by analogy with terbium 7
Barium Ba 56 Alkaline earth metal the Greek barys, 'heavy' 2 6 137.327
Astatine At 85 Metalloid the Greek astatos, 'unstable' 17 6
Arsenic As 33 Metalloid English word (Latin arsenicum) 15 4 74.921595
Argon Ar 18 Noble gas the Greek argos, 'idle' 18 3 39.948
Antimony Sb 51 Metalloid uncertain: perhaps from the Greek anti, 'against', and monos, 'alone', or the Old French antimoine, 'Monk's bane' (stibium in Latin) 15 5 121.76
Americium Am 95 Actinide The Americas, as the element was first synthesized on the continent, by analogy with europium 7
Aluminium Al 13 Post-​transition metal from alumina, a compound (originally alumium) 13 3 26.981539
Actinium Ac 89 Actinide the Greek aktis, 'ray' 3 7