AS chemistry - definition recap key definitions for AS chemistry. 3.5 / 5 based on 2 ratings ? ChemistryASAll boards Created by: HeiwaCreated on: 29-10-12 14:22 Define 1st ionisation energy? the amount of energy needed to remove 1 electrons, from each atom, in a mole of atoms, in the gas phase. 1 of 14 Define isotope an atom of an element with the same number of protons but a different number of neutrons 2 of 14 Define relative atomic mass the weighted mean mass of an atom of an element compared to 1/12th the mass of an atom of carbon 12 3 of 14 Define relative isotopic mass the mass of an atom of an isotope compared to 1/12th of the mass of an atom of carbon-12 4 of 14 what is an orbital? a region of space around the nucleii of an atom which can hold up to 2 electrons in opposite spins 5 of 14 Define relative formula mass the weights mean mass of a formula unit compared to 1/12th of the mass of carbon-12 6 of 14 what is a sushell? a group of the same type of atomic orbitals within an electron shell 7 of 14 what is the mole? a mole of a substance contains the same number of particles as there are in 12.0g of carbon-12 8 of 14 Define empirical formula the simplest whole number ratio of atoms of an element in a compound 9 of 14 molecular formula the actual number of atoms of each element in a compound 10 of 14 Define ionic bonding the electrostatic attraction between oppositely charged ions 11 of 14 Define giant ionic lattice electrostatic forces of attraction between oppositely charged ions, which extends into 3D 12 of 14 Define covalent bond a bond that is formed from a shared pair of electrons 13 of 14 dative covalent bonding a shared pair of electrons that came from the same atom 14 of 14
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