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The mass number of a nucleus is Always l...

The mass number of a nucleus is
Always less than its atomic number
Always more than its atomic number
Sometimes equal to its atomic number
Sometimes more than and sometimes equal to its atomic number

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Atomic number is equal to the

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What is its atomic number and valency?

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Assertion:Atomic number is a more fundamental property of an element than its atomic mass. Reason:Atomic number is equal to number of protons in an atom.

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In a radioactive disintegration, the ratio of initial number of atoms to the number of atoms present at an instant of time equal to its mean life is