IONISATION ENERGY Flashcards

1
Q

what is ionisation energy

A

energy needed to remove one mole of electrons from one mole of gaseous atoms

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2
Q

trend of ionisation energy down group 2

A

1st ionisation energy decreases - more shielding because there are more shells between the nucleus and the elctron being removed so the electron being removed is further from the nucleus

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3
Q

trend of ionisation energy across period 3

A

1st ionisation energy increases - nuclear charge increases and similar shielding because all the electrons being removed are from the same shell

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4
Q

why is aluminium anomalous

A

aluminiums outer electron is in the 3p orbital which has slightly higher energy so less energy is needed to remove it

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5
Q

why is sulphur anomalous

A

in sulphur one of the 3p orbitals contain a pair of electrons and they repel eachother making the electron easier to move

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