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the number of protons in the nucleus of an atom of an element, called atomic number

atom

an atom having a valence of one

subatomic particles

a diatomic molecule

marks for representing certain kinds of atom

diatomic

[a species] of an atomic nucleus

a group of atoms, called {nitro radicals}

an atom of carbon

an essential element of an atom, called an atomic nucleus

atomic hydrogen

a radioactive chemical element of atomic number 84, called {polonium}

any element having an atomic number greater than 92 (which is the atomic number of uranium)

an atom of hydrogen

a halogen element whose atomic number is 17, called chlorine

a negatively charged ion

a chemical element in which atoms have identical atomic numbers but different masses

the metallic element of atomic number eighty-two

a nonmetallic element with an atomic number of 6, called carbon

an assemblage group of atoms, called complex atom

a ring of atoms of more than one kind

a trivalent acceptor atom

a nonmetallic element whose atomic number is 5, called boron

a radioactive metallic element having the atomic number 91

The atomic number of iron is 26.

an element of atomic number 60 called neodymium

a chemical element whose atomic number is 33, called arsenic

the sum of the number of neutrons and protons in an atomic nucleus

the mass of an atom of a chemical element expressed in atomic mass units