The main difference between atomic number and atomic weight is that atomic number gives the number of protons present in the nucleus whereas atomic weight gives the mass of an atom. These are two fundamental facts about an atom. What is the difference between atomic weight and atomic number?Ītomic number and atomic weight are two important chemical terms. 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. It is the weighted average of the masses of naturally-occurring isotopes.Ītoms are the basic units of matter and the defining structure of elements. What is atomic weight used for?Ītomic weight is the average mass of atoms of an element, calculated using the relative abundance of isotopes in a naturally-occurring element. Accordingly, the number of protons, which is always equal to the number of electrons in the neutral atom, is also the atomic number. What does the atomic number of an atom represent?Ītomic 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.
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