Key Terms

Question 1

Atomic Number

Answer 1

Sum of all the protons in the nucleus

Question 2

Mass Number

Answer 2

Sum of all the Protons and Neutrons in the nucleus of an atom

Question 3

Isotope

Answer 3

An atom with the same number
of protons but different amount
of neutrons

Question 4

Relative Molecular Mass

Mr

Answer 4

The average mass of a molecule compared to 1/12 of Carbon 12

Question 5

First Ionisation Energy

Answer 5

The energy required to remove the most loosely held electron from 1 mole of gaseous atoms to produce 1 mole of gaseous ions with a charge of 1+

Question 6

First Ionisation Energy Equation

Answer 6

X(g) -> X^+(g) + e