Atomic Structure Key Definitions

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  • Created by: JasmineR
  • Created on: 05-11-15 21:17
Relative atomic mass
The average mass of an atom compared to one twelfth of the mass of an atom of carbon 12.
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Relative molecular mass
The average mass of a molecule compared to one twelfth of the mass of one atom of carbon 12.
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Isotope
Atoms with the same number of protons (and electrons) but different numbers of neutrons.
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Proton number
The number of protons in the nucleus of an atom; the same as the atomic number.
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Molecular ion
In mass spectrometry this is a molecule of the sample which has been ionised but which has not broken up during its flight through the instrument.
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Strong nuclear force
The force that holds protons and neutrons together within the nucleus of the atom.
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Atomic orbital
A region of space around an atomic nucleus where there is a high probability of finding an electron.
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Mass number
The total number of protons plus neutrons in the nucleus of an atom.
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Ions
Positive or negative atoms that have lost or gained electrons.
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Atomic number
The number of protons in the nucleus of an atom (same as the proton number).
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Ionisation energy
The energy required to remove a mole of electrons from a mole of isolated gaseous atoms or ions.
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Other cards in this set

Card 2

Front

The average mass of a molecule compared to one twelfth of the mass of one atom of carbon 12.

Back

Relative molecular mass

Card 3

Front

Atoms with the same number of protons (and electrons) but different numbers of neutrons.

Back

Preview of the back of card 3

Card 4

Front

The number of protons in the nucleus of an atom; the same as the atomic number.

Back

Preview of the back of card 4

Card 5

Front

In mass spectrometry this is a molecule of the sample which has been ionised but which has not broken up during its flight through the instrument.

Back

Preview of the back of card 5
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