Electron Arrangement & Ionisation Energies

Question 1

Define an Isotope

Answer 1

Isotopes - Atoms of the same element but with a different number of neutrons.

Question 2

Define Relative Isotopic Mass

Answer 2

Relative Isotopic Mass - The mass of an atom of an isotope compared to 1/12th of the mass of an atom of carbon-12.

Question 3

Define Relative Atomic Mass

Answer 3

Relative Atomic Mass- The average mass of an atom of an element compared to 1/12th of the mass of an atom of carbon-12.

Question 4

Define an Orbital/Atomic Orbital

Answer 4

Atomic Orbital - A region within an atom that can hold up to 2 electrons with opposite spins.

Question 5

Define First Ionisation Energy

Answer 5

First Ionisation Energy - The energy required to remove 1 mol of electrons from 1 mol of gaseous atoms.

Question 6

Define Successive Ionisation Energies

Answer 6

Successive Ionisation Energies - A measure of the energy required to remove each electron in turn from an atom.

Question 7

Explain the general trend in ionisation energies across a period (5 Marks)

Answer 7

1. Across the period there is a general increase in the ionisation energy.
2. This is because there are more protons in the nucleus.
3. But the outer electron is in the same shell/same shielding
   4.