Atomic Structure Revision Structured Question

The following diagram was obtained from an analysis of naturally-occurring isotopes of chlorine.

Atomic structure SQ.PNG

(a)    Define the term ‘isotopes’.



(b)    Using the diagram, calculate the relative atomic mass of a sample of
naturally occurring chlorine.




(c) What is the difference between Chlorine-37 and Chlorine-35?





(a) Isotopes are atoms of the same element with the same number of protons but                 different numbers of neutrons.

(b) (0.75)x 35 + (0.25)x37 = 35.5

(c) Chlorine-37 contains 17 protons and 20 neutrons in its nucleus while Chlorine-35         contains 17 protons and 18 neutrons in the nucleus.

OR Chlorine-37 has 2 more neutrons than chlorine-35
[reject: the different numbers of neutrons]
[reject: chlorine-37 has a mass number of 37 while chlorine-35 has a mass number       of 35]


Author: matharena

Math Educator

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s