Chemistry- definitions: atomic structure

mass number
total number of protons and neutrons in the nucleus of an atom of an element
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atomic number
the number of protons in the nucleus of an atom
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first ionisation energy
the enthalpy change for the removal the removal of one mole of electrons from one mole of atoms in the gas phase
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empirical formula
the simplest whole number ratio of atoms of each element present in a molecule
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relative atomic mass
average mass of one atom of an element divided by one twelfth of a carbon12 atom
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relative molecular mass
average mass of one molecule divided by one twelfth of a carbon12 atom
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structural isomers
compounds with the same molecular formula but different structures
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displayed formula
an arrangement which shows all bonds present in a molecule
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functional group
an atom or group of atoms that when present in different molecules, causes them to have similar chemical properties
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isotopes
atoms of the same element with the same atomic number but different mass numbers
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electronegativity
the power of an atom to attract the shared pair of electrons in a covalent bond
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Other cards in this set

Card 2

Front

the number of protons in the nucleus of an atom

Back

atomic number

Card 3

Front

the enthalpy change for the removal the removal of one mole of electrons from one mole of atoms in the gas phase

Back

Preview of the back of card 3

Card 4

Front

the simplest whole number ratio of atoms of each element present in a molecule

Back

Preview of the back of card 4

Card 5

Front

average mass of one atom of an element divided by one twelfth of a carbon12 atom

Back

Preview of the back of card 5
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