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 |
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
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