Which of these statements about an atom is incorrect ?
A) The number of protons equals the number of electrons.
B) The number of protons equals the atomic number.
C) The number of protons always equals the number of neutrons.
D) The mass number is the sum of protons and neutrons in the atom.
E) The mass number minus the atomic number equals the number of neutrons in the atom.

Question

Quizplus · Accepted Answer

The number of protons does not always equal the number of neutrons in an atom. The number of neutrons can vary for a given element, which results in different isotopes of that element.

Which of These Statements About an Atom Is Incorrect