Revise GCSE Physics

Question:What is the nucleus of an atom and from what is the nucleus composed?

The nucleus is composed of protons and neutrons;

Except for hydrogen which has only a single proton in the nucleus.

The diagram represents the helium atom (not to scale).

The green spheres represent the uncharged neutrons, the red spheres are the positively changed neutrons and the yellow spheres are the negatively changed electrons.

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