Isotopes & Relative Atomic Mass

Question 1

What is an isotope?

Answer 1

Isotopes are atoms of the same elements which have the same number of protons but a different amount of neutrons.

Question 2

Isotopes have the …….. atomic number but …….. mass numbers.

Answer 2

same, different

Question 3

What is the difference between the mass number and relative atomic mass?

Answer 3

Mass number is the sum of protons and neutrons whereas relative atomic mass is the weighted average mass of an atom based on the abundance of that element’s isotopes.

Question 4

What is the equation to calculate the relative atomic mass of an element from its isotopic abundances?

Answer 4

(Isotope mass x isotope abundance) + (Isotope mass x isotope abundance)
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100