1.1.7: Ionisation energies

Question 1

Ionisation

Answer 1

where one electron is removed from the atom

Question 2

Ionisation equation

Answer 2

e- on right hand side of equation

Question 3

Ionisation energies

state

Answer 3

in gas phase

Question 4

Ionisation energy

first

Answer 4

the energy required to remove an electron from every atom in a mole of atomic gas to produce a mole of unipositive gaseous ions

Question 5

Factors affecting ionisation

3

Answer 5

shielding
nuclear charge
distance from the nucleus

Question 6

How does shielding affect ionisation energy

Answer 6

more electrons between nucleus and outer electrons = lower nuclear charge
(+charge from nucleus decreased by more electrons in between)
so greater no. of electrons = lower ionisation energy

Question 7

How does nuclear charge affect ionisation energy

Answer 7

more protons in nucleus = greater attraction of electron to nucleus
more energy needed to remove electron

Question 8

How does distance from the nucleus affect ionisation energy

Answer 8

electrostatic attraction decreases w/ distance
less energy required to remove further away electrons
increase in distance, decrease in ionisation energy

Question 9

Ionisation energy … down a group

why

Answer 9

decreases

atomic radius increases

Question 10

Ionisation energy … across a period

why

Answer 10

increases

increase in proton number and nuclear charge

Question 11

Exceptions

Answer 11

look at sub-shells

Question 12

Electron repulsion impact on ionisation energy

Answer 12

easier to remove an electron from an orbital with 2 electrons in than 1 because the electrons repel each other