atoms, ions,compounds (unit 1)
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11 Terms
What is meant by the term ‘Isotope’?
Atoms of the same element with a different number of neutrons and different masses.
What is meant by the term ‘Relative Atomic Mass’ (Ar)?
The weighted mean mass of an atom compared to 1/12th the mass of carbon-12.
What is meant by ‘Relative Formula Mass’ (Mr)?
The weighted mean mass of a formula unit compared to 1/12th the mass of carbon-12.
(blanket term for any formula - particularly ionic compounds/giant structures)
What is meant by ‘Relative Molecular Mass’ (Mr)?
The weighted mean mass of a molecule compared to the 1/12th the mass of carbon-12.
(Used only for simple covalent molecules (e.g.H2O))
What is meant by ‘Relative Isotopic Mass’?
The mass of an isotope compared to 1/12th the mass of carbon-12.
What is the mathematical expression for working out Ar?
How would you predict Ionic Charges from the periodic table?
Using group number.
Group 1 metals - Form +1 ions by losing one electron
(Group 2 & 3 form +2 & +3)
Group 5 non-metals - Form -3 ions by gaining three electrons
(Group 6 forms -2 ions & Group 7 form -1 ions)
What is the formula and charge for Nitrate?
What is the formula and charge for Carbonate?
What is the formula and charge for Sulfate?
