Chemistry Definitions

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  • Created by: Adye
  • Created on: 19-04-13 11:32
A region within an atom that can hold up to two electrons with opposite spin.
Orbital
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It has the same numerical value as the mole but has units g/mol.
Molar Mass
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The sum of the number of protons and neutrons in an atom.
Mass Number
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...of an element is the energy required to remove one electron from each atom in one mole of gaseous atoms to form unipositive gaseous ions.
First Ionisation Energy
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Atoms of the same element that have different masses. Isotopes of an element have the same number of protons but different numbers of neutrons.
Isotopes
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It is the weighted mean mass of an atom of an element compared with 1/12 the mass of an atom of carbon-12 which is taken as 12 exactly.
Relative Atomic Mass
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This is the result of sharing a pair of electrons.
Covalent Bonding
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It is the mass of an atom of an isotope of the element compared with 1/12 the mass of an atom of carbon-12 which is taken as 12 exactly.
Relative Isotopic Mass
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...of an ion is the energy required to remove the second electron from each unipositive gaseous ion in one mole of gaseous ions to form dipositive gaseous ions.
Second Ionisation Energy
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The number of protons contained in an atom of an element.
Atomic Number
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The number of particles in a mole. Its symbol is NA and is equals 6.023x20(23)
Avogadro's Constant
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It is an amount of substance and contains the same number of particles as there are atoms in 12g of carbon-12
Mole
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It is the ability of an atom to attract the bonding electrons in a covalent bond.
Electronegativity
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It is the attraction of positive ions to delocalised electrons
Metallic Bonding
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This is the electrostatic attraction between oppositely charged ions.
Ionic Bonding
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It is the weighted mean mass of a molecule of a compound compared with 1/12 the mass of a carbon-12 atom which is taken as 12 exactly.
Relative Molecular Mass
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It is the weighed mean mass of a formula unit of a compound compared with 1/12 the mass of an atom of carbon-12 which is taken as 12 exactly.
Relative Formula Mass
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It is the simultaneous oxidation and reduction of the same species in a chemical reaction.
Disproportionation
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Other cards in this set

Card 2

Front

It has the same numerical value as the mole but has units g/mol.

Back

Molar Mass

Card 3

Front

The sum of the number of protons and neutrons in an atom.

Back

Preview of the front of card 3

Card 4

Front

...of an element is the energy required to remove one electron from each atom in one mole of gaseous atoms to form unipositive gaseous ions.

Back

Preview of the front of card 4

Card 5

Front

Atoms of the same element that have different masses. Isotopes of an element have the same number of protons but different numbers of neutrons.

Back

Preview of the front of card 5
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