Question

Which list gives the numbers of subatomic particles for a neutral atom of helium?

OPTION 1: 2 protons, 2 neutrons, 2 electrons
OPTION 2: 2 protons, 2 neutrons, 4 electrons
OPTION 3: 4 protons, 2 neutrons, 2 electrons
OPTION 4: 4 protons, 4 neutrons, 4 electrons

Answer 1

A neutral atom of helium has 2 protons, 2 neutrons, and 2 electrons, which corresponds to Option 1 on the list provided.

Step-by-step explanation:

The numbers of subatomic particles for a neutral atom of helium are: 2 protons, 2 neutrons, and 2 electrons. This is because helium has an atomic number of 2, meaning it has 2 protons in its nucleus. To remain neutral in charge, the number of electrons must equal the number of protons. Most helium atoms also have 2 neutrons, giving them a mass number of 4 atomic mass units (amu), which is the sum of the protons and neutrons. Therefore, Option 1: 2 protons, 2 neutrons, 2 electrons is the correct list for a neutral helium atom.