Atoms and Reactions

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Isotopes
Atoms of the same element with different numbers of neutrons.
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Atomic (proton) number
the number of protons in the nucleus of an atom.
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Mass (nucleon) number
the number of sub atomic particles (protons and neutrons) in the nucleus
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Ion
A positively or negatively charged atom or (co-valently bonded) group of atoms (a molecular ion)
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Relative isotopic mass
the mass of an atom of an isotope compared with one-twelfth of the mass of an atom of Carbon (12)
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Relative atomic mass Aᵣ
the weighted mean mass of an atom of an element compared with one-twelfth of thr mass of an atom of carbon (12)
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Relative molecular mass Mᵣ -
the weighted mean mass of a molecule compared with one-twelfth of the mass of an atom of carbon (12)
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Relative formula mass
the weighted mean mass of a formula unit compared with one-twelfth of the mass of an atom of carbon (12)
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Amount of substance
The quantity whose unit is the mole. Chemists use ‘amount of substance’ as a means of counting atoms.
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Avogadro constant Nᴬ
the number of atoms per mole of carbon (12) isotope (6.02 x 10²³ mol-1 )
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Mole
the amount of any substance containing as many particles as there are carbon atoms in exactly 12g of the carbon(12) isotope.
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Molar Mass M
the mass per mole of a substance. The units of molar mass are g mol-1
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Other cards in this set

Card 2

Front

Atomic (proton) number

Back

the number of protons in the nucleus of an atom.

Card 3

Front

Mass (nucleon) number

Back

Preview of the front of card 3

Card 4

Front

Ion

Back

Preview of the front of card 4

Card 5

Front

Relative isotopic mass

Back

Preview of the front of card 5
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