Árbók Ísafoldar - 01.11.1948, Page 104

102 Efnafræði og eðlisfræði
Tákn Frumefni Nr Atóm- þungi Gildi Eðlisþyngd Bræðslustig (Celsius)
Ac Aktinium 89 226,0
AI Aluminium 13 26,97 3 2,54-2,70 658
Sb Antimon (Stibium) 51 121,76 3—5 6,65 630
Ar(A) Argon 18 39,944 . 0 1,33* — 189,6
As Arsen 33 74,91 3-5 4,71-5,72
Ba Barium 56 137,36 2 3.80 850
Be(Q) Beryllium (Glucinium) 4 9,02 2 1,84 1280
Pb Blý (Plumbum) 82 207,21 2—4 11,35 327,4
(RaQ) Blý Úranblý _ 206,0 —
(ThD) Blý Thoriumblý — 208 0 —
B Bór 5 10,82 3 2,45-2,53 2000-2500
H Vetni (Hydrogenium) 1 1,008 1 0,0695* -259
Br Bróm 35 79,916 1 3,1893* —7,3
Cd Cadmium 48 112,41 2 8,65 320,9
Ca Calcium 20 40,03 2 1,42 810
Cp(Lu) Cassiopeium (Lutecium) 71 174,99 3 _
Ce Cerium 58 140,13 I co ca. 7 640
Cs Cæsium 55 132,91 1 1,87 26,4
Dy(Ds) Dysprosium 66 162,46 3 — _
Em(Nt,Rn) Emartation (Niton, Radon) 86 222,0 0 ca. 8* -f-71
Er Erbium 63 167,2 3 4,77
Eu Europium 63 152,0 3
F Fluor 9 19,00 1 1,31* -233
P Fosfór (Phosphorus) 15 3D,98 3-5 1,84—2,20 44,3 (Kut)
Gd Gadolinium 64 156,9 3 1,31
Ga Gallium 31 69,72 3 5,96 30,15
Ge Germanium 32 72,60 4 5,46 960
Au Gull (Aurum) 79 197,2 1-3 19,3 1063
Hl(Ct) Hafnium (Celtium) 72 178,6 0 13,3 2600
He Helium 2 4,003 0 0,137* —272
Ho Holmium 67 163,5 3 _
11 Jllinium 61 — 3
O Udi lOxygenium) 8 16,000 2 1,105* —227
ln lr dium 49 114,76 3 7,25 155
Ir Iridium 77 193,1 4 22,4 ca. 2400
Fe Járn (Ferrnm) 26 55,85 2-3 7,86 1530
J Joð 53 126,92 1 4,95 114
K Kalium 19 39,096 1 0,865 62,5
C1 Klór 17 35,457 1 2,49* — 101,6
Cu Kopar (Cuprum) 29 63,57 1-2 8,95 1083
Co Kobolt 27 58.94 2- 3 8,8 1490
Cr Króm 24 52,01 2-3-6 7,1 1890
Kr Krypton 36 83,7 0 2,818 — 169
C Koletni (Carbonium) 6 12,010 4 2,2-3,5 ca.4000
H e Kvikasilfur (Mydrargyrum) 0 200,61 1-2 13,55 -38,9
N Hyldi (Nitrogenium) 7 14.008 3-5 0,967* -210
La Lanthan 57 133,92 3 6,155 810
Li Lithium 3 6,94 1 0,534 180
Mg Magnium 12 24,32 2 1,70 650
Mn Mangan 25 54,93 2-3-7 7,2 ca.1250
Ma Masurium 43 98,0 99,5 2-3—7 —
Mo Molybdæn 42 95,95 4-6 10,2 ca. 2450
Na Natríum 11 22,997 1 0,978 97,6
Nd Neodym 60 144,27 3 6,96 840
*e Neon 10 20,183 0 0,674* —253
Ni Nikkel 28 58,69 2-3 8,6 8,9 1452