Which contributes more to an atom's mass: electrons or protons? Which contributes more to an atom's size?
A)Protons contribute more to an atom's mass while electrons contribute more to its size.
B)Electrons contribute more to an atom's mass while protons contribute more to its size.
C)Protons contribute more to both the mass and size of an atom.
D)Electrons contribute more to both the mass and size of an atom.

Question

Quizplus · Accepted Answer

Electrons have very little mass and are responsible for the size of an atom due to their electron cloud. Protons, on the other hand, have much more mass and are found in the nucleus, contributing to the overall mass of the atom.

Which Contributes More to an Atom's Mass: Electrons or Protons