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With the help of given Table 4.1, 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
"
Oxygen,
No. of protrons = 8
Therefore, no. of neutral = 8
Therefore, Atomic number = 8
Therefore, Atomic mass number = P+N
= 8+8
= 16
Sulphur,
No. of protrons = 16
Therefore, no. of neutral = 16
Therefore, Atomic number = 16
Therefore, Atomic mass number = P+N
= 16+16
= 32
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