Question

Give the atomic number of first 20 elements .

Answer 1

Hydrogen = 1
Helium = 2
Lithium = 3
Beryllium = 4
Boron = 5
Carbon = 6
Nitrogen = 7
Oxygen = 8
Fluorine = 9
Neon = 10
Sodium = 11
Magnesium = 12
Aluminium = 13
Silicon = 14
Phosphorus = 15
Sulphur = 16
Chlorine = 17
Argon = 18
Potassium = 19
Calcium = 20

Answer 2

Hydrogen
1

Helium
2

Lithium
3

Beryllium
4

Boron
5

Carbon
6

Nitrogen
7

Oxygen
8

Fluorine
9

Neon
10

Sodium
11

Magnesium
12

Aluminium
13

Silicon
14

Phosphorus
15

Sulfur
16

Chlorine
17

Argon
18

Potassium
19

Calcium
20

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