Give the valency and atomic mass of the first 20 elements and other important elements.

S.No.

ELEMENT

Atomic mass

VALENCY

1

Hydrogen

1

1

2

Helium

4

0

3

Lithium

6.94

1

4

Beryllium

9

2

5

Boron

10.81

3

6

Carbon

12

2,4

7

Nitrogen

14

3,5

8

Oxygen

16

2

9

Fluorine

19

1

10

Neon

20

0

11

Sodium

22.99

1

12

Magnesium

24.31

2

13

Aluminum

27

3

14

Silicon

28

4

15

Phosphorus

31

3,5

16

Sulfur

32

2,4,6

17

Chlorine

35.45

1,3,5,7

18

Argon

40

0

19

Potassium

39

1

20

Calcium

40

2

  • 108
  • -17
  • -15
HydrogenAtomic Number: 1
Symbol: H
Atomic Mass: 1
Protons: 1
Neutrons: 0
Electrons: 1
HeliumAtomic Number: 2
Symbol: He
Atomic Mass: 4
Protons: 2
Neutrons: 2
Electrons: 2
LithiumAtomic Number: 3
Symbol: Li
Atomic Mass: 7
Protons: 3
Neutrons: 4
Electrons: 3
BerylliumAtomic Number: 4
Symbol: Be
Atomic Mass: 9
Protons: 4
Neutrons: 5
Electrons: 4
BoronAtomic Number: 5
Symbol: B
Atomic Mass: 11
Protons: 5
Neutrons: 6
Electrons: 5
CarbonAtomic Number: 6
Symbol: C
Atomic Mass: 12
Protons: 6
Neutrons: 6
Electrons: 6
NitrogenAtomic Number: 7
Symbol: N
Atomic Mass: 14
Protons: 7
Neutrons:7
Electrons: 7
OxygenAtomic Number: 8
Symbol: O
Atomic Mass: 16
Protons: 8
Neutrons: 8
Electrons: 8
FluorineAtomic Number: 9
Symbol: F
Atomic Mass: 19
Protons: 9
Neutrons: 10
Electrons: 9
NeonAtomic Number: 10
Symbol: Ne
Atomic Mass: 20
Protons: 10
Neutrons: 10
Electrons: 10
SodiumAtomic Number: 11
Symbol: Na
Atomic Mass: 23
Protons: 11
Neutrons: 12
Electrons: 11
MagnesiumAtomic Number: 12
Symbol: Mg
Atomic Mass: 24
Protons: 12
Neutrons: 12
Electrons: 12
AluminumAtomic Number: 13
Symbol: Al
Atomic Mass: 27
Protons: 13
Neutrons: 14
Electrons: 13
SiliconAtomic Number: 14
Symbol: Si
Atomic Mass: 28
Protons: 14
Neutrons: 14
Electrons: 14
PhosphorusAtomic Number: 15
Symbol: P
Atomic Mass: 31
Protons: 15
Neutrons: 16
Electrons: 15
SulfurAtomic Number: 16
Symbol: S
Atomic Mass: 32
Protons: 16
Neutrons: 16
Electrons: 16
ChlorineAtomic Number: 17
Symbol: Cl
Atomic Mass: 35
Protons: 17
Neutrons: 18
Electrons: 17
ArgonAtomic Number: 18
Symbol: Ar
Atomic Mass: 40
Protons: 18
Neutrons: 22
Electrons: 18
PotassiumAtomic Number: 19
Symbol: K
Atomic Mass: 39
Protons: 19
Neutrons: 20
Electrons: 19
CalciumAtomic Number: 20
Symbol: Ca
Atomic Mass: 40
Protons: 20
Neutrons: 20
Electrons: 20
  • 27
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