Atoms of the same proton number but with a different number of neutrons.
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Relative Isotopic Mass
Mass of an atom of an isotope compared with 1/12 of the mass of an atom of carbon-12.
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Relative Atomic Mass
Weighted mean mass of an element compared with 1/12 of the mass of an atom of carbon-12.
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Relative Molecular Mass
Weighted mean mass of a molecule compared with 1/12 of the mass of an atom of carbon-12.
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Relative Formula Mass
Weighted mean mass of a formula unit compared with 1/12 of the mass of an atom of carbon-12.
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Avogadro Constant
Number of atoms per mole (6.02 x 10²³ mol⁻¹).
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Mole
Amount of any substance containing as many particles as there are carbon atoms in exactly 12g of carbon-12 isotope.
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Molar Mass
Mass per mole of a substance (g mol⁻¹).
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Concentration
Amount of solute, in mol, dissolved per 1 dm³ of solution.
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Cation
Positively charged ion.
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Anion
Negatively charged ion.
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Oxidation
Loss of electrons (an increase in oxidation number).
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Reduction
Gain of electrons (a decrease in oxidation number).
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Electron Shielding
Repulsion between electrons in different inner shells.
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1st Ionisation Energy
Energy required to remove one mole of electrons from one mole of gaseous atoms, forming one mole of positive ions in the gaseous state. X (g) → X⁺ (g) + e⁻.
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2nd Ionisation Energy
Energy required to remove one mole of electrons from one mole of positive ions in the gaseous state. X⁺ (g) → X²⁺ (g) + e⁻.
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3rd Ionisation Energy
Energy required to remove one mole of electrons from one mole of X²⁺ ions in the gas phase. X²⁺ (g) → X³⁺ (g) + e⁻.
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Ionic Bonding
Electrostatic attraction between oppositely charged ions.
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Covalent Bonding
Bond formed by a shared pair of electrons.
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Metallic Bonding
Electrostatic attraction between positive metal ions & delocalised electrons.
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Electronegativity
The ability of an atom to attract towards it the shared pair of electrons in a covalent bond.
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Other cards in this set
Card 2
Front
Number of protons and neutrons in a nucleus.
Back
Mass Number
Card 3
Front
Atoms of the same proton number but with a different number of neutrons.
Back
Card 4
Front
Mass of an atom of an isotope compared with 1/12 of the mass of an atom of carbon-12.
Back
Card 5
Front
Weighted mean mass of an element compared with 1/12 of the mass of an atom of carbon-12.
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