Chemguide: Support for CIE A level Chemistry

This statement is in three parts. The first part is essentially a repeat of learning outcome 2(d), and I am not going to add anything extra about that. The second and third parts deal with isotopes, although the third part is again a repeat of material from outcome 2(d).

Before you go on, you should find and read the statement in your copy of the syllabus.

Isotopes

You will find a short piece about isotopes about a third of the way down the page a simple view of atomic structure, and that is really all you need.

If you are asked to define isotopes you should include the facts that:

• They are atoms of the same element, having the same proton (or atomic) number

• but with different nucleon (or mass) numbers

• because they have different numbers of neutrons.

Working out the numbers of protons, neutrons and electrons in a given isotope is no different from any other similar sum. (See learning outcome 2(d).)

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