With the help of given Table, find out the mass number of oxygen and sulphur atom.

Table: Composition of Atoms of the First Eighteen Elements with Electron Distribution in Various Shells.

Name of Element Symbol Atomic number Number of Protons Number of Neutrons Number of electrons

Distribution of electrons    K

L

M

N

Valency

Hydrogen

Helium

Lithium

Beryllium

Boron

Carbon

Nitrogen

Oxygen

Fluorine

Neon

Sodium

Magnesium

Aluminium

Silicon

Phosphorus

Sulphur

Chlorine

Argon

H

He

Li

Be

B

C

N

O

F

Ne

Na

Mg

Al

Si

P

S

Cl

Ar

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

2

4

5

6

6

7

8

10

10

12

12

14

14

16

16

18

22

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

1

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

1

2

3

4

5

6

7

8

8

8

8

8

8

8

8

8

1

2

3

4

5

6

7

8

 

1

0

1

2

3

4

3

2

1

0

1

2

3

4

3,5

2

1

0

 

Asked by Vishal kumar | 1 year ago |  187

1 Answer

Solution :-

(a) To find the mass number of Oxygen:

Number of protons = 8

Number of neutrons = 8

Atomic number = 8

Atomic mass number = Number of protons + number of neutrons = 8 + 8 = 16

Therefore, mass number of oxygen = 16

(b) To find the mass number of Sulphur:

Number of protons = 16

Number of neutrons = 16

Atomic number = 16

Atomic mass number = Number of protons + number of neutrons = 16 + 16 = 32

Answered by Vishal kumar | 1 year ago

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