What subatomic particles could be changed without changing which element the atom is? i. electron ii. proton iii. neutron?

The correct answer is option iii. neutron

Explanation:

Hello! Let's solve this!

Atoms are made up of electrons, protons, and neutrons.

The electrons are negatively charged. Protons are positively charged. Neutrons have no charge.

The protons and neutrons are in the nucleus.

In this case, the answer is neutrons since, since they do not have a charge, changing their number will not affect either the charge or the atomic number of the atom.

We conclude that the correct answer is option iii. neutron

if you mean hydrogen and oxygen then water is the product

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