The number of protons and neutrons in the nucleus of an atom
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Mass number
The number of protons and neutrons in nucleus of an atom
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Isotope
Atoms of the same element with a different number of neutrons in the nucleus and hence with a different mass number
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Avogadro's constant
6.02 x 10^23 , the number of particles in 1 mole of a substance
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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
The weighted mean mass of an atom of an element 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 (add together the Ar values of each atom in the formula)
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Relative molecular mass (Mr)
The weighted mean mass of a molecular compound compared with one-twelfth of the mass of an atom of Carbon-12
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Half life
The time it takes for half the radioactive nuclei in a sample to decay
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Nuclear fusion
A nuclear reaction in which smaller atomic nuclei fuse to form a heavier nuclei which releases energy
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Absorption spectra
Black lines on a coloured background corresponding to the absorptions of energy by the electrons
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Emission spectra
Coloured lines on a black background seen when a chemical burns with a coloured flame
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Other cards in this set
Card 2
Front
The number of protons and neutrons in nucleus of an atom
Back
Mass number
Card 3
Front
Atoms of the same element with a different number of neutrons in the nucleus and hence with a different mass number
Back
Card 4
Front
6.02 x 10^23 , the number of particles in 1 mole of a substance
Back
Card 5
Front
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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