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Chemistry Vocabulary
Term | Definition |
---|---|
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. |