Question

Give atomic mass of elements from 1 to 20.

Answer 1

Hydrogen
1    H 1
Helium
4   He 2
Lithium
7   Li 3
Beryllium
9    Be 4
Boron
11     B  5
Carbon
12    C 6
Nitrogen
14     N 7
Oxygen
16   O 8
Fluorine
19   F 9
Neon
20 Ne 10
Sodium
23 Na 11
Magnesium
24   Mg 12
Aluminium
27  Al 13
Silicon
28  Si 14
Phosphorus
31   P 15
Sulphur
32   S 16
Chlorine
35.5  Cl
Argon
40   Ar 18
Potassium
39 K 19
Calcium
40 Ca 20

Answer 2

Hydrogen 1 H 1

Helium 4 He 2

Lithium 7Li 3

Beryllium 9  Be 4

Boron 11 B 5

Carbon 12C 6

Nitrogen 14 N 7

Oxygen 16 O 8

Fluorine 19   F 9

Neon 20 Ne 10

Sodium 23 Na 11

Magnesium 24 Mg 12

Aluminium 27  Al 13

Silicon 28 Si 14

Phosphorus 31 P 15

Sulphur 32 S 16

Chlorine 35.5  Cl 17

Argon 40Ar 18

Potassium 39 K 19

Calcium 40 Ca 20


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