IONISATION ENERGY

Question 1

what is ionisation energy

Answer 1

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

Question 2

trend of ionisation energy down group 2

Answer 2

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

Question 3

trend of ionisation energy across period 3

Answer 3

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

Question 4

why is aluminium anomalous

Answer 4

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

Question 5

why is sulphur anomalous

Answer 5

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