1
IIT-JEE 1983
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Elements of the same mass number but of different atomic numbers are known as ____.
2
IIT-JEE 1982
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Isotopes of an element differ in the number of ______ in their nuclei.
3
IIT-JEE 1982
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The mass of a hydrogen atom is ______ kg.
4
IIT-JEE 1982
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When there are two electrons in the same orbital, they have _____ spins.
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