Question

which statement(s) is/are false?
select all that apply
a neutral atoms are made of specific numbers of protons and electrons but the number of neutrons they possess can vary a little bit.
b all atoms are about the same size.
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:

• Statement a: Neutral atoms have equal numbers of protons and electrons. Atoms of the same element (same number of protons) can have different numbers of neutrons (isotopes). So, this statement is true.
• Statement b: Atoms vary in size. For example, a hydrogen atom (\(H\)) is much smaller than a cesium atom (\(Cs\)). So, this statement is false.
• Statement c: Protons and neutrons are in the nucleus. They are held together by the strong nuclear force (not repelling each other). So, this statement is false.
• Statement d: The number of protons (atomic number) determines the element. For example, an atom with 1 proton is hydrogen (\(H\)), with 2 protons is helium (\(He\)). So, this statement is true.

Answer:

B. All atoms are about the same size.
C. Protons and neutrons repel each other and position themselves far apart inside the atom.