3.1.1 Atomic Structure

Question 1

Isotopes

Answer 1

Atoms with the same number of protons but different numbers of neutrons.

Question 2

Relative Isotopic Mass

Answer 2

The mass of an atom of an isotope compared to C-12 on a scale where an atom of C-12 has a mass of exactly 12.

Question 3

Relative Atomic Mass, Ar

Answer 3

The average Mass of an atom of an element compared to C-12 on a scale where an atom of C-12 has a Mass of exactly 12.

Question 4

Equation of Ar

Answer 4

(Sum of mass × abundances) /( sum of all abundances)

Question 5

Orbital

Answer 5

A volume of space which can hold up to two electrons of opposite spin.

Question 6

1st Ionisation energy

Answer 6

The energy required to remove 1 mole of electrons from 1 mole of gaseous atoms.

Question 7

2nd Ionisation energy

Answer 7

The energy required to remove 1 mole of electrons from 1 mole of singly positive ions in the gaseous state.

Question 8

Shielding

Answer 8

The protective effect that fully filled electron shells have on the attraction between the nucleus and outer electrons.

Question 9

Relative molecular mass, Mr

Answer 9

The average mass of a molecule compared to C-12 on a scale where an atom of C-12 has a mass of exactly 12.

Question 10

Relative formula mass

Answer 10

The average mass of a formula unit of a compound compared to C-12 on a scale where an atom of C-12 has a mass of 12.