Question

3 according to the model, what part of an atom contains most of its mass? a the mass is spread evenly throughout the atom b most mass is in the atom’s nucleus (center) c most mass is at the furthest edges of an atom d the mass shifts locations in the atom as it moves

Explanation:

To determine the part of an atom with most mass, we recall atomic structure: protons and neutrons (with significant mass) are in the nucleus, while electrons (negligible mass) orbit. So most mass is in the nucleus. Option A is wrong (mass not spread evenly), C is wrong (edges have electrons with little mass), D is wrong (mass doesn't shift like that).

Answer:

B. Most mass is in the atom’s nucleus (center)