Glossary of unit 1 key terms

This will give all the key definitions from unit 1

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  • Created on: 04-01-12 17:33
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GLOSSARY OF USEFUL TERMS FOR UNIT 1
Topic 1.1
Atomic number: the number of protons in the nucleus of an atom
Mass number: the total number of protons and neutrons in the nucleus of an atom
Isotopes: atoms with the same atomic number but different mass numbers
or atoms with the same number of protons but different numbers of neutrons
Relative isotopic mass: the ratio of the mass of one atom of that isotope to 1/12th of the mass
of one atom of carbon12
Relative atomic mass: the ratio of the average mass of an atom to 1/12th of the mass of one
atom of carbon12
Relative molecular mass: the ratio of the average mass of a molecule (or formula unit) to
1/12th of the mass of carbon12
First ionisation energy: the heat energy required to remove one electron from each of a mole
of free gaseous atoms of that element
Second ionisation energy: the heat energy required to remove one electron from each of a
mole of free gaseous unipositive ions of that element
Topic 1.2
Avogadro's number: the number of elementary particles that there are in 12.000 grams of
carbon12
Mole: the amount of a substance containing the same number of elementary particles as there
are in 12.000 grams of carbon12
Molar mass: the mass of a substance containing the same number of elementary particles as
there are in 12.000 grams of carbon12
Empirical formula: the simplest whole number ratio in which the atoms of each element in a
compound are found
Molecular formula: the number of atoms of each element in one molecule of the substance

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Topic 1.3
Ionic bond: an attraction between oppositely charged ions
Covalent bond: a pair of electrons shared between two atoms
Dative covalent bond: a pair of electrons shared between two atoms, one of which provides
both of the electrons
Metallic bond: an attraction between a cation and a sea of delocalised electrons
Electronegativity: the ability of an atom to attract electrons towards itself in a covalent bond.…read more

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