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question 17 of 20 | total points: 15 out of 20
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by definition, the atomic number is the number of
in the
nucleus of the atom. in order for an atom to be neutral, the number of
protons must be equal to the number of
. the

of an atom is determined by adding together the protons
and the neutrons. isotopes are atoms of an element that have different
mass numbers because of differing numbers of
.
atomic number mass number neutrons protons

Explanation:

The atomic number is defined by proton count. A neutral atom has equal protons and electrons. Mass number is sum of protons and neutrons. Isotopes vary in neutron number.

Answer:

1. protons
2. electrons
3. mass number
4. neutrons