Question

select all that apply
a all atoms are about the same size.
b neutral atoms are made of specific numbers of protons and electrons but the number of neutrons they possess can vary a little bit.
c protons and neutrons repel each other and position themselves far apart inside the atom.
d the number of protons determines what type of element an atom is.

Explanation:

• a: Atoms vary in size based on electron - shell structure and nuclear charge.
• b: In neutral atoms, number of protons = number of electrons, and neutrons can vary (isotopes).
• c: Protons and neutrons are in the nucleus and held together by strong nuclear force, not repelled.
• d: Atomic number (number of protons) defines the element.

Answer:

B. Neutral atoms are made of specific numbers of protons and electrons but the number of neutrons they possess can vary a little bit.
D. The number of protons determines what type of element an atom is.