The mass number of a nucleus is?
...The mass number of a nucleus is?
Always less than its atomic number
The sum of the number of protons and neutrons present in the nucleus
Always more than the atomic weight
A fraction
Correct answer is B
mass number, is the sum of the numbers of protons and neutrons present in the nucleus of an atom.
When the trioxonitrate (IV) salt of an alkali metal Y is heated, the formula of the residue is ...
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A major effect of oil pollution in coastal waters is the? ...