Radience

Atoms

Science

atom

the smallest particle of an element
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atomic mass

the average mass of all the isotopes of an element
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atomic number

number of protons in an atom’s nucleus
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electron

a negatively charged particle outside the nucleus of an atom
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electron cloud

the region around an atomic nucleus where electrons are likely to be found
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element

a substance made of one type of atom that cannot be broken down chemically
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energy level

a region of an atom where electrons with the same energy are found
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isotope

an atom of the same element with a different number of neutrons
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mass number

the sum of neutrons and protons in an atom’s nucleus
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neutron

an uncharged particle in the nucleus of an atom
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nucleus atom

the center of an atom
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proton

a particle with a positive charge in an atom’s nucleus
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