isotopes are atoms of thesame element with thesame atomic number but with different atomic mass. E.g chlorine with isotope 35Cl and 37Cl. While molecule is the smallest particle of a substance that can exist independently and still retain the chemical properties of that substance e.g O2,cl2....
A molecule is a bond of two or more atoms, resulting in a chemically inert compound. The atoms share electrons, filling all outer shells of the incorporated atoms. An atom requires so many electrons per shell, in order to be electrically neutral; the first level, that being the closest to the nucleus, requiring two electrons to be balanced, the second shell filling 6 electrons, 10 in the third shell and increasing exponentially the further away from the nucleus. Each shell can only fit that many electrons, but a shell with fewer electrons in a shell than it takes to fill it (with the exception of an entirely empty shell) makes the atom more prone to bonding with another atom. This is the case with Hydrogen, with only 1 electron in the first shell, but requiring 2 to fill it's first shell; naturally bonds with another hydrogen atom forming H2, a diatomic molecule; or a molecule made up of only two atoms. Conversely, Helium, the second atom on the periodic table, consisting of two electrons in it's first shell, is naturally neutral and is part of the Nobel gases on the periodic table; elements that have a natural fill of their electron shells with just one atom. These elements have a low chemical reactivity and seldom bond with other material.
An isotope is an atom of a particular element, wit a different atomic mass than the normal element. It possesses the same number of electrons and protons, but posses a varying number of neutrons in it's nucleus. H1, the most common isotope of Hydrogen, consists of a hydrogen atom that contains one proton and no neutron in the nucleus. Physical properties of isotopes can vary, some even being radioactive while others are inert.
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