Did you know that atoms are so small that you can’t even see them? The number of atoms in a grapefruit is almost equal to the number of blueberries one would need to fill up the entire sphere of planet Earth. Atoms consist of four main parts, protons, electrons, neutrons, and the nucleus. The protons and the neutrons make up the nucleus. The nucleus is as hard to find as a blueberry in a football field.

The electrons, which are much smaller than the protons and the neutrons orbit the nucleus. The number of protons in an atom (also known as atomic number) determines which element the atom represents, and generally its physical properties. That is the purpose of the atomic numbers.

The electrons are negatively charged particles whereas the protons are positively charged. The positive and negative charges cancel each other out and the atom is neutral. The Electricity is the flow of electrons from one atom to another.