BLOCK 4 Ionisation energy

Question 1

Molar first ionisation energy definition

Answer 1

energy required to remove 1 mole of electrons from 1 mole of its gaseous atom to form 1 mole of 1+ ions
X(g) –> X+(g) +e-

Question 2

Molar second ionisation energy definition

Answer 2

energy required to remove 1 mole of electrons from a mole of 1+ ions to form 1 mole of 2+ ions

Question 3

how does ionisation energy change attraction

Answer 3

The greater the attraction, the greater the ionisation energy

Question 4

What does attraction depend on?

Answer 4

size of nuclear charge

The distance of the outer electron for the nucleus

The shielding effect by electrons (in filled inner shells.)

Question 5

size of nuclear charge

Answer 5

• Greater the nuclear charge, greater the attractive force

Question 6

The distance of the outer electron for the nucleus

Answer 6

• The further the distance, the lower the attractive
  force

Question 7

The shielding effect by electrons (in filled inner shells.)

Answer 7

• It’s the repulsion between electrons in different shells.
• Electrons are all negative so repel each other.
• The more filled inner shells, the lower the ionisation energy.

Question 8

On a graph of first ionisation energy, which group occupy peaks

Answer 8

group 0

Question 9

On a graph of first ionisation energy, which group occupy troughs

Answer 9

group 1