chapter 1 definitions

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6 Terms

1

proton number/atomic number

the number of protons in the nucleus of an atom and indicates the elements position in the periodic table

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2

nucleon number/mass number

the number of protons and neutrons found in the nucleus of an atom of an element

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3

orbital

the volume of space in which there is a 95% chance of finding an electron

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4

isotopes

atoms of the same element with the same number of protons, but different number of neutrons

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5

the first ionisation energy

the enthalpy change required to move one mole of electrons from one mole of gaseous atoms to form one mole of gaseous unipositive cations.

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6

the second ionisation energy

enthalpy change required to remove one mole of electrons from one mole of gaseous univalent cations to form one mole of unipositive cations.

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