Ionisation energy

Question 1

Define first ionisation energy

Answer 1

The energy required to remove one mole of electrons from one mole of atoms in their gaseous state to form one mole of 1+ ions

Question 2

Define successive ionisation energy

Answer 2

The continued removing of electrons, measuring the ionisation energy each time

Question 3

What factors affect ionisation energy?

Answer 3

Atomic radius- as the atomic radius increases, the nucleus’ attraction to outer electrons decreases

Nucleus charge- the more protons, the greater the force of attraction

Shielding- electrons in outer shells are repelled by inner shells

Question 4

What does a large increase in an ionisation graph show?

Answer 4

That an inner shell has been ionised, and thus what group the element is in

Question 5

Ionisation energy trends across a period?

Answer 5

Generally, the first ionisation energy increases, due to their being a larger nuclear charge, resulting in a smaller atomic radius

Question 6

Ionisation energy trends down a group?

Answer 6

Generally decreases down a group due to the atomic radius increasing and shielding, resulting in the nucleus’ attraction to outer electrons decreasing

Question 7

How does you write a first ionisation energy equation? (General formula)

Answer 7

X (g) ——>X^+ (g) + e^-