Element Builder Gizmo Vocab

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Nucleus

Back

Positively charged central part of an atom.

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Atom

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Basic unit of matter.

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Atomic number

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The number of protons in the nucleus of an atom.

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Radioactive

Back

Elements that spontaneously emit radiation.

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Valence electrons

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Electrons on the outermost energy level of an atom.

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Neutron

Back

A particle in the nucleus of the atom, with no electrical charge.

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Proton

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A particle in the nucleus that has a positive charge.

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Electron

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A negatively charged particle that orbits the nucleus of an atom.

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Isotope

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An atom with the same number of protons but a different number of neutrons.

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Element

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A pure substance made of only one kind of atom.