F321 Definitions

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Relative isotopic mass
The mass of an atom of an isotope compared to 1/12th of the mass of an atom of carbon-12.
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Relative atomic mass
The weighted mean mass of an atom of an element compared to 1/12th of the mass of an atom of carbon-12.
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Relative molecular mass
The weighted mean mass of the molecules of a substance compared to 1/12th of the mass of an atom of carbon-12.
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Relative formula mass
The weighted mean mass of the formula unit compared to 1/12th of the mass of an atom of carbon-12.
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Empirical formula
The simplest whole number ratio of atoms of each element in a compound
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Molecular formula
The actual number of atoms of each element in a molecule
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Atomic number
The number of protons in an atom or an ion of an element
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Mass number
The number of protons and neutrons in the nucleus of an atom
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Isotopes
Atoms of the same element with the same number of protons, but different numbers of neutrons
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1st ionisation energy
The energy required to remove one electron from each atom in one mole of gaseous atoms to form 1 mole of gaseous 1+ ions
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2nd ionisation energy
The energy required to remove 1 electron from each 1+ ion in 1 mole of gaseous 1+ ions to form 1 mole of gaseous 2+ ions
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nth ionisation energy
The energy required to remove 1 electron from each (n-1)+ ion in 1 mole of gaseous (n-1)+ ions to form 1 mole of gaseous n+ ions
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Ionic bond
Electrostatic attraction between oppositely charged ions
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Covalent bond
A shared pair of electrons
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Dative covalent bond
A shared pair of electrons where both of the bonding electrons come from the same atom
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Electron pair repulsion theory
Electron pairs repel each other meaning the number of electron pairs around a central atom determines its shape
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Electronegativity
The attraction that each bonded atom has for the pair of electrons in the covalent bond
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Polar bond
A covalent bond between two atoms with different electronegativities in which the bonded electron pair is drawn closer to the more electronegative ion
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Polar molecule
A molecule in which the electron density is not equally distributed resulting in areas of high electron density(d-) and areas of low electron density(d+)
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Metallic bond
The attraction between positive ions and free(or delocalised) electrons
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Other cards in this set

Card 2

Front

The weighted mean mass of an atom of an element compared to 1/12th of the mass of an atom of carbon-12.

Back

Relative atomic mass

Card 3

Front

The weighted mean mass of the molecules of a substance compared to 1/12th of the mass of an atom of carbon-12.

Back

Preview of the back of card 3

Card 4

Front

The weighted mean mass of the formula unit compared to 1/12th of the mass of an atom of carbon-12.

Back

Preview of the back of card 4

Card 5

Front

The simplest whole number ratio of atoms of each element in a compound

Back

Preview of the back of card 5
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