Question

How does an atom consisting protons, neutrons and electrons form in the first place?

Answer 1

Answer:

Atoms were created after the Big Bang 13.7 billion years ago. As the hot, dense new universe cooled, conditions became suitable for quarks and electrons toform. Quarks came together to form protons and neutrons, and these particles combined into nuclei.

Answer 2

Answer:

The protons and neutrons of an atom are both arranged in the nucleus. The protons have a positive charge while neutrons have a neutral charge and their weight together creates the Atomic Mass of an atom.

Electrons circle around the nucleus of an atom, they are negatively charged and atoms with a neutral charge - atoms that aren't ions - have the same amount of protons and electrons, the charges of the particles then cancel each other out and create a neutral charge for the entire atom.

Depending on how deep you want to get into the chemistry of it are usually arranged in shells with 2 electrons in the first, 8 in the second and 8 in the third. Any further than that would be getting into orbitals.