Question
How does the nucleus of an atom change when it gains electrons? It gets lighter It gains protons It doesn't It gets heavier
Answer
4
(337 Votes)
Maria
Master · Tutor for 5 years
Answer
C
Explanation
The nucleus is the part of the atom that contains protons and neutrons, these particles determine the atom's mass number. When an atom gains electrons, a change occurs in its electron cloud -- the area surrounding the nucleus that contains electrons -- not with the nucleus itself. Gaining electrons affects the electric charge of the whole atom turning it into a negative ion, but it does not add to or subtract from the protons or neutrons in the nucleus of the atom. Therefore, the nucleus does not change.