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), Atomic Orbital - Region (with no definite boundary) in space around nucleus in which there is high probability of finding an electron, Atomic Energy Level - Fixed amount of energy of an electron in an atom, Electronegativity - Measure of attraction of an atom for shared electrons in a covalent bond, Flourine - The most electronegative element., Francium - The least electronegative element. (Also said to be electropositive), Ground State - In lowest energy state or in n = 1 level (shell), Excited State - Higher energy state or in n > 1 level (shell), Dalton's Atomic Theory - All matter is made of indivisible small particles called atoms, Carbon Dating - Estimate age of an object containing carbon based on C-14 to C-12 ratio, Bohr Orbit - 2-D pathway at fixed distance from nucleus where electron is definitely located,

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