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Chemistry Vocabulary

TermDefinition
Atomic Number Number of protons in the nucleus of an atom.
Mass Number Number of protons and neutrons in a nucleus.
Isotopes Atoms with the same atomic number but different mass number (measured using a mass spectrometer).
Ion Atom or group of atoms with an electric charge.
Relative Atomic Mass (RAM) Average mass of an element including the abundance of the isotopes.
Molecules A group of atoms joined by covalent bonds.
Covalent bonds A chemical bond that involves sharing a pair of electrons between atoms in a molecule.
Molecular formula Number of atoms of each element (eg H2O2).
Relative formula mass Sum of all the relative atomic mass’ of each atom in a formula.
Mole The relative formula mass in grams.
Immiscible Liquids which can not mix, do not dissolve.
Miscible Can completely dissolve in any proportions (eg alcohol + water)
Isomers Molecules with the same molecular formula but a different arrangement of atoms in the molecule and different properties.
Created by: 100007117483106