You'll often find the word atomic specifically describing power or weapons — in this case, atomic means the process of either splitting an atom, known as fission, or joining two atoms, fusion, to create energy. ... Atomic comes from the Latin atomus, "indivisible particle," from the Greek atomos, "uncut" or "indivisible."

Why is it called atomic?

Atoms are made up of a nucleus, protons and electrons. ... The term "atom" comes from the Greek word for indivisible, because it was once thought that atoms were the smallest things in the universe and could not be divided.

What is atomic number short answer?

atomic number, the number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of protons in the nucleus. Accordingly, the number of protons, which is always equal to the number of electrons in the neutral atom, is also the atomic number.