etermine how adding the missing particles would change the atom's electrical charge.There would be no changeThe atom would gain a positive chargeThe atom would lose its chargeThe atom would gain a negative charge

The change in an atom's electrical charge when adding missing particles depends on the type of particle being added:

1. Adding Protons: Protons carry a positive charge. If you add more protons to an atom, the atom would gain a positive charge.

2. Adding Electrons: Electrons carry a negative charge. If you add more electrons to an atom, the atom would gain a negative charge.

3. Adding Neutrons: Neutrons carry no charge. If you add more neutrons to an atom, there would be no change in the atom's electrical charge.

So, the atom could either gain a positive charge, gain a negative charge, or there would be no change, depending on the particle added. The atom would not lose its charge as none of the particles carry a 'negative' charge that could negate the existing charge of the atom.