Question

Give the mass number of 1 to 20 elements.

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

Sulfur

32 S 16

Chlorine

35 Cl 17

Argon

40 Ar 18

Potassium

39 K 19

Calcium

40 Ca 20

Answer 2

1 1
2 4
3 7
4 9
5 11
6 12
7 14
8 16
9 19
10 20
11 23
12 24
13 27
14 28
15 31
16 32
17 35.5
18 36
19 39
20 40

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