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Atoms

Science

Atoms Chapter Video

Atoms Chapter Video

atom

the smallest particle of an element
atom Simple Definition

atomic mass

the average mass of all the isotopes of an element
atomic mass Simple Definition

atomic number

number of protons in an atom’s nucleus
atomic number Simple Definition

electron

a negatively charged particle outside the nucleus of an atom
electron Simple Definition

electron cloud

the region around an atomic nucleus where electrons are likely to be found
electron cloud Simple Definition

element

a substance made of one type of atom that cannot be broken down chemically
element Simple Definition

energy level

a region of an atom where electrons with the same energy are found
energy level Simple Definition

isotope

an atom of the same element with a different number of neutrons
isotope Simple Definition

mass number

the sum of neutrons and protons in an atom’s nucleus
mass number Simple Definition

neutron

an uncharged particle in the nucleus of an atom
neutron Simple Definition

nucleus atom

the center of an atom
nucleus atom Simple Definition

proton

a particle with a positive charge in an atom’s nucleus
proton Simple Definition

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