Which statement describes the location of two types of subatomic particles in a helium atom?

Answer is: Protons and neutrons are located in the  nucleus.

Atomic number (Z) is total number of protons and mass number (A) is total number of protons and neutrons in a nucleus.

Nucleus of an atom has positive charge, electrons are negative and atom has neutral net charge.

Helium (symbol: He) is an element with atomic number 2 (2 protons) and mass number 4 (2 neutrons; n° = 4 - 2 = 2).

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error