the basic structural unit of matter
atom
matter
element
nucleus
a collection of atoms of one type that cannot be broken down into simpler substances by ordinary chemical or physical means
element
subatomic particle
electron
matter
the positively charged subatomic particle contained in the nucleus of an atom
proton
neutron
electron
matter
a subatomic particle, contained in the nucleus of an atom, having the same mass as a proton but no electrical charge
proton
neutron
electron
matter
a negatively charged subatomic particle that orbits the nucleus of an atom
proton
neutron
electron
matter
a unique number for each element that equals the number of protons in an atom of that element
element name
element symbol
atomic number
atomic mass
the mass of an atom, calculated by adding the number of protons and neutrons in the nucleus of the atom
element name
element symbol
atomic number
atomic mass
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