Give reasons for the following:
(iv) An element to have atoms with different mass number.
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Give reasons for the following:
(iv) An element to have atoms with different mass number.
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Answer:-
Different isotopes of the same element have the same atomic number. They have the same number of protons. The atomic number is decided by the number of protons. Isotopes have different mass numbers, though, because they have different numbers of neutrons.
Answer:
Isotopes are atoms that have the same atomic number (and are therefore of the same element) but different mass numbers.