General Chemistry Terms

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Isotopes
Isotopes are atoms of the same element with different numbers of nuetr
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Atomic (proton) number
Atomic number if the number of protons in the nucleus of an atom.
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Mass (nucleon) number
Mass number is the number of particles in the nucleus of an atom (Neutrons + Protons).
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Ion
An ion is a positively or negatively charged atom or covalently bonded group of atoms.
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Relative isotopic mass
Relative atomic mass is the mass of an atom of an isotope compared with one-twelth of the mass of one atom of Carbon-12
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Relative atomic mass
Relative atomic mass is the mass of an atom of an atom compared with one-twelfth of the mass of one atom of Carbon-12
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Relative molecular mass
Relative molecular mass is 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
Relative formula mass is the weighted mean mass of a formula unit compared with one-twelfth of the mass of an atom carbon-12
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Amount of substance
Amount of substance is the quantity whose unit is the mole. Chemists use 'amount of substance' as a means of counting atoms.
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Avogadro Constant
The avogadro constant is the number of atoms per mole of carbon-12 isotope (6.02x10^23 mol^-1).
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Mole
A mole is 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
Molar mass is the mass per mole a substance. The units of molar mass are g/mol^-1
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Empirical Formula
The empirical formula is the simplest whole-number ratio of atoms of each element present in a compound.
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Molecule
A molecule is a small group of atoms held together by covalent bonds.
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Card 2

Front

Atomic number if the number of protons in the nucleus of an atom.

Back

Atomic (proton) number

Card 3

Front

Mass number is the number of particles in the nucleus of an atom (Neutrons + Protons).

Back

Preview of the back of card 3

Card 4

Front

An ion is a positively or negatively charged atom or covalently bonded group of atoms.

Back

Preview of the back of card 4

Card 5

Front

Relative atomic mass is the mass of an atom of an isotope compared with one-twelth of the mass of one atom of Carbon-12

Back

Preview of the back of card 5
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