Module 2 - Electrons Bonding and Structure.

Question 1

Define First Ionisation energy.

Answer 1

The first ionisation energy of an element is the energy required to remove one electron from each atom in one mole of gaseous atoms to one mole of gaseous 1+ ions.

Question 2

Define Electron Shielding.

Answer 2

Electron Shielding is the repulsion between electrons in different inner shells. Shielding reduces the net attractive force from the positive nucleus on the outer shell electrons.

Question 3

What is the energy needed to form positive ions called?

Answer 3

The ionisation energy.

Question 4

What can ionisation energy provide evidence for?

Answer 4

Ionisation can provide evidence for the model of the atom in which electrons are arranged in shells.

Question 5

What three factors affect the Ionisation Energy?

Answer 5

Nuclear Charge.
Electron Shielding or Screening.
Atomic Radius.

Question 6

What happens to the attraction of the outer electrons in an atom as the shielding effect increases?

Answer 6

The attraction between the outer electrons is lower and therefore less energy is needed for ionisation of these electrons.

Question 7

What is successive ionisation energies?

Answer 7

Successive ionisation energies are a measure of the energy required to remove each electron in turn. Second ionisation energy.. etc.