Multiple choice

The isotopes of an element differ in

  1. the charge on the nucleus

  2. the number of neutrons in the nucleus

  3. the number of extra nuclear electrons

  4. both the nuclear charge and the number of extra nuclear electrons
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Atoms of the same element can have different numbers of neutrons; the different possible versions of each element are called isotopes. For example, the most common isotope of hydrogen has no neutrons at all; there's also a hydrogen isotope called deuterium, with one neutron, and another, tritium, with two neutrons.

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