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प्रश्न
The diagram represents an isotope of hydrogen [H]. Answer the following:

Atomic no. = 1
Mass no. = 1
If an isotope of ‘H’ has mass no. = 3, how many neutrons does it have.
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उत्तर
Two neutrons. .........[∵ A = P + n]
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What are the atomic numbers of elements whose outermost electrons is represented by 3s1.
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