NCERT Class XI Chemistry Structure of Atom Solutions

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NCERT Class XI Chemistry Structure of Atom Solutions

Question : 41

Total: 67

Symbols

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Br and

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Br can be written, whereas symbols

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Br and

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Br are not acceptable. Answer briefly.

Solution:

Atomic number should be a subscript while mass number should be a superscript of the symbol of an element. Thus,

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Br is not acceptable. The atomic number is fixed, but different isotopes of bromine atoms may have different mass numbers. Therefore, it is essential to mention mass number.

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