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?

 

 

 




Answer:

(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]

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Author: matharena

Math Educator

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