molecule - A group of atoms covalently bonded together, compound - Two or more different types of atoms chemically bonded together, atom - The smallest particle that retains the properties of the substance, element - Made of only one type of atom, diatomic - A molecule with two of the same type of atom chemically bonded, mixture - Two or more substances not chemically bonded together, periodic table - A chart that organizes all known elements based on their properties, ionic - type of bonding between a metal and a non-metal, covalent - bonding between two non-metals, isotope - atoms of the same element with same number of protons but different number of neutrons, ion - an atom that has lost or gained electrons , nucleus - centre of an atom, proton - subatomic particle with a positive charge, neutron - subatomic particle with a negative charge, electron - subatomic particle with a neutral charge,

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