Chemguide: Support for CIE A level Chemistry

This statement deals with the way that mass and charge are arranged in the atom.

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

This is completely trivial!

The mass of the atom is concentrated in the nucleus because that is where you find the protons and neutrons. The electrons are found at some distance from the nucleus, and contribute very little to its overall mass.

Because of the protons, the nucleus is positively charged. The electrons surrounding the nucleus are, of course, negatively charged.

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