Answer:
Number of electrons
Step-by-step explanation:
An atom is made up of three fundamental subatomic particles called protons, neutrons and electrons.
Protons are the positively charged particles in an atom.
Neutrons do not carry any charges
Electrons are negatively charged.
Both protons and neutrons occupy the tiny nucleus. The extra-nuclear space is filled with electrons.
- In a neutral atom, the number of protons and electrons are the same.
- In a charged atom, the number of protons and electrons differ.