10 © UCLES 2016 H 1 1. 00 8 H e 2 4. 00 3 Li 3 6. 94 1 B e 4 9. 01 2 sy m bo l at om ic n um be r m ea n at om ic m as s B 5 10 .8 1 C 6 12 .0 1 N 7 14 .0 1 O 8 16 .0 0 F 9 19 .0 0 N e 10 20 .1 8 N a 11 22 .9 9 M g 12 24 .3 1 A l 13 26 .9 8 Si 14 28 .0 9 P 15 30 .9 7 S 16 32 .0 6 C l 17 35 .4 5 A r 18 39 .9 5 K 19 39 .1 0 C a 20 40 .0 8 Sc 21 44 .9 6 Ti 22 47 .8 7 V 23 50 .9 4 C r 24 52 .0 0 M n 25 54 .9 4 Fe 26 55 .8 5 C o 27 58 .9 3 N i 28 58 .6 9 C u 29 63 .5 5 Zn 30 65 .3 8 G a 31 69 .7 2 G e 32 72 .6 3 A s 33 74 .9 2 Se 34 78 .9 7 B r 35 79 .9 0 K r 36 83 .8 0 R b 37 85 .4 7 Sr 38 87 .6 2 Y
