Atom - Smallest amount of an element that still has the chemical properties of that element., Compound - A substance made from two of more different elements chemically combined., Ion - An atom or molecule with a charge., A positive ion has... - lost electrons., A negative ion has... - gained electrons., Atomic Radius - Half the distance between the nuclei of two identical atoms (of the same element) joined by a single covalent bond, Relative Atomic Mass - Average mass of atoms of element compared (relative) to 1 /12 mass of carbon-12 isotope, First Ionisation Energy - Minimum energy to remove most loosely-bound electron from an isolated gaseous atom in its ground state, Isotopes - Atoms of same element with different mass numbers due to different number of neutrons or atoms with same atomic number (Z) but different mass numbers (A, Heisenberg’s Uncertainty Principle - It is not possible to measure the exact position and momentum of electron in atom simultaneously (at the same time),

Basic Chemistry Definitions 1-10

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