Isotopes

Question 1

Define isotope

Answer 1

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

All atoms that belong to the same element have the same atomic number but do not always have the same mass number

Question 2

Recall isotopic notation

Answer 2

A/Z[X] or X-A
For example: 14/6[C] or carbon-14

• A = Mass number (Z + number of neutrons)
• Z = Atomic number (number of protons)
• X = Chemical symbol for the element

Question 3

Describe and explain relative atomic mass

Answer 3

The average mass of one atom of an element, relative to the mass of carbon-12

Question 4

Recall the formula of relative atomic mass

Answer 4

((abundance % × atomic mass) + (abundance % × atomic mass))/100