Atoms with the same number of protons but a different number of neutrons.
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Define atomic number.
The number of protons in the nucleus of an atom.
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Define mass number
The sum of the protons and neutrons in the nucleus of an atom.
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Define relative atomic mass.
The mass of an atom relative to that of the carbon 12 isotope having the value of 12.
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Define empirical formula.
The simplest whole number ratio of the elements in a compound.
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Define molecular formula.
The exact number of atoms of each element in the formula of a compound.
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What is a functional group?
A functional group is an atom or group of atoms which when present in different molecules causes them to have simular chemical properties.
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When going across a period from left to right does electro-negativity increase or decrease ?
Increase.
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When going down a group does electro-negativity increase or decrease ?
Decrease.
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In larger molecules are permanent dipole forces or van der waals forces stronger ?
van der waals.
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Define first ionisation energy.
The first ionisation energy of an element is defined as the enthalpy change for the removal of one mole of electrons from one mole of atoms of the element in the gas phase
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Define molecular formula.
The molecular formula gives the actual number of atoms of each element present in a molecule.
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What is a structural isomer?
structural isomers are compounds with the same molecular formula but different structures.
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What is the general trend of first ionisation energies across period 3?
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