Isotopic Abundance Warm-up Quiz

Click on the exam question, read it fully, then complete the answer below:

The isotopes are both atoms of carbon,

because they both have six _______.

The isotopes also both have the same number of _________, as this is equal to the number of protons.

Click on the exam question, read part b, then complete the answer below:

The number of ________ in each isotope is given by

mass number - atomic (proton) number.

The isotope on the left has 8 neutrons,

whereas the isotope on the right has .... neutrons.

Click on the information about two isotopes of the element boron and study it.

What do you think the word "abundance" means?

• How likely it is that each isotope will react.

• How much of each isotope there is in a sample of boron atoms.

• What percentage of each isotope is made up of neutrons.

• Something else

On the GCSE Periodic Table,

the Relative Atomic Mass given for Boron is 11.

Complete the sentence explaining why.

Boron-11 atoms are much more common than boron-10 atoms

So the _______ mass of a boron atom is closer to 11 than 10.