Question

what are sub - atomic particles?​

Answer 1

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Subatomic particles include electrons, the negatively charged, almost massless particles that nevertheless account for most of the size of the atom, and they include the heavier building blocks of the small but very dense nucleus of the atom, the positively charged protons and the electrically neutral neutrons.

Answer 2

☞︎︎︎ Atom consists of smaller particles like electron,proton,neutron, neutrino, antineutrino,meson,pion,anti proton. But these are unstable and exist for a fraction of second only.

☞︎︎︎ Electron,proton and neutron are fundamental particles of atom.

☞︎︎︎ All atoms except hydrogen contains these fundamental particles.

☞︎︎︎ In hydrogen electron and proton are present and neutron is absent.