The number of protons present in ATOM 1 is_
The number of electrons present in ATOM 1 is_

There are three protons and three electrons in atom 1.

Explanation: An atom is made up of three particles: protons, electrons and neutrons. Protons and neutrons are found in the central located nucleus of an atom while electrons are found outside the nucleus where they revolve round the nucleus. Protons are positively charged, electrons are negatively charged while neutrons have no charge.

From the diagram above, there are three positive charges in the center, and these positive charges are protons while there are three negative charges outside the center, and these negative charges are electrons. Therefore, there are three electrons and three protons in the atom.