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

##### 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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