Chemistry - Atomic Structure - Definition

Question 0

Mass Number

Answer 0

The number of protons and neutrons in the nucleus.

Question 1

Atomic Number

Answer 1

The number of protons in the nucleus.

Question 2

Isotope

Answer 2

Atoms of an element with different number of neutrons.

Question 3

Relative Isotopic Mass

Answer 3

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

Question 4

Relative Atomic Mass

Answer 4

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

Question 5

Relative Molecular Mass

Answer 5

The average mass of a molecule compared to 1/12th the mass of an atom of carbon-12.

Question 6

Relative Formula Mass

Answer 6

The average mass of a formula of a compound compared to 1/12th the average mass of an atom of carbon-12.

Question 7

First Ionisation Energy

Answer 7

The minimum amount of energy required to remove one electron from each atom in one mole of gaseous atoms to produce 1+ ion.

Question 8

Second Ionisation Energy

Answer 8

The minimum amount of energy required to remove one electron from each ion in one mole of gaseous atoms to form 2+ ions.

Question 9

Atomic Orbital

Answer 9

The region within an atom that can hold up to 2 electrons with opposite spins.