Info

Proton

Electron cloud

Proton

Helium-3

Neutron

Helium-3

Nucleus

Neutron

Electron cloud figure 2-2

Helium-4

Nucleus

Helium-4

Most scientists consider the electron cloud model, shown above, to be the most accurate model of an atom. Here the models show the difference between elements and isotopes. Helium-3 has two protons and one neutron, while Helium-4 has two protons and two neutrons.

www.scilinks.org Topic: Atomic Structures Keyword: HM60119

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