Question 2 unsaved a neutral atom has an atomic number of 20 and a mass number of 42. how many electrons does the atom have?

Atomic number refers to the number of protons an atom has. Since this atom has 20 protons in the nucleus, the charge of the nucleus is +20 (neutrons, also in the nucleus, contribute zero charge). Thus, for the atom to be neutral, its electrons must balance the +20 charge of the nucleus, so it must have 20 electrons.

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