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

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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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Updated on: 10-Oct-2022

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