Question

Match each vocabulary word with its definition.

1 the number of protons plus neutrons in the nucleus
ion
2. negative subatomic particles, symbolized by e
atomic mass or mass number
electrons
atom with a net charge caused by unequal numbers of
electrons and protons
same element but different mass number due to numbers of
neutrons in the nucleus
unstable and capable of disintegrating into different
elements, producing radiation and energy
radioactive
5.
isotope
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Answer 1

1. The number of protons plus neutrons in the nucleus is the atomic mass or mass number.
2. Negative subatomic particles, symbolized by e are electrons.
3. An atom with a net charge caused by unequal numbers of electrons and protons are ions.
4. Atoms of the same element but with different mass numbers due to number of neutrons in the nucleus are isotopes.
5. Unstable atoms capable of disintegrating into different elements, producing radiation and energy are radioactive.