Question

Seein an atom figure doesn't looks that it would have only three sub-atomic particles, or the known sub-atomic particles cannot be divided, if it is then how many sub-atomic particles are present with their names and if not why?

Answer 1

An atom is made up of only three fundamental and indivisible particles- electrons, protons and neutrons. This information is sufficient at your level.
They cannot be further divided but broken down into further particles. An electrons can't be broken further due to its extreme small size but protons and neutrons can be.
Protons and neutrons are made up of three 'quarks' each. Quarks cannot exit on their own and are stable only when combined.