3.1 ionisation energies

Question 1

what is ionisation?

Answer 1

ionisation is the removal of one or more electrons from an atom

Question 2

what is the first ionisation energy?

Answer 2

the first ionisation energy is the energy needed to remove 1 mole of an electron from 1 mole of gaseous atoms

Question 3

what process is ionisation energy?

Answer 3

ionisation energy is an endothermic process

Question 4

what is an endothermic process

Answer 4

an endothermic process is…

Question 5

what is the equation for the first ionisation energy of oxygen?

Answer 5

the equation for the first ionisation energy of oxygen:

O₂(g) → O⁺(g) + e⁻

Question 6

what does a lower ionisation energy mean?

Answer 6

a lower ionisation energy means it is easier to form an ion

Question 7

what factors affect ionisation energy?

Answer 7

the factors which affect ionisation energy are:

• atomic radii
• nuclear charge
• shielding

Question 8

how does atomic radii affect ionisation energy?

Answer 8

the greater the atomic radius, the easier it is to remove electrons as the attraction decreases

Question 9

how does nuclear charge affect ionisation energy?

Answer 9

greater nuclear charge
greater attraction
higher ionisation energy

Question 10

how does shielding affect ionisation energy?

Answer 10

increased shielding
decreased attraction
lower ionsation energu

Question 11

what does a high ionisation energy have?

Answer 11

a high ionisation energy