Ionisation energy

Question 1

Define first ionisation energy

Answer 1

energy required to remove one electron from each atom in one mole of gaseous atoms

Question 2

Define second ionisation energy

Answer 2

Energy required to remove one electron from one ion in one mole of gaseous ion

Question 3

Whats the equation for 1st IE?

Answer 3

X(g) —-> X+(g) + e-

Question 4

Whats the equation for 2nd IE?

Answer 4

X+(g) —-> X2+(g) + e-

Question 5

Why does IE decrease down a group?

Answer 5

Atomic radius increases which means shielding increases which means theres less nuclear attraction therefore less energy is needed

Question 6

Why does IE increase across a period?

Answer 6

Atomic radius decreases making it harder to remove an electron as nuclear charge increases (more protons) and shielding remains the same so more energy is needed

Question 7

Why does atomic radius decreases across a period

Answer 7

Attraction between nucleus and electrons increase, outer electrons are added to the same shell so no extra shielding

Question 8

Why does atomic radius increase down a group?

Answer 8

Extra shells are added (further away) and this means greater shielding

Question 9

Why does nuclear attraction always increase?

Answer 9

More protons