When the proton number and electron number are unequal, the atom or molecule __________.

Answer
Unselected
becomes part of a molecule

Unselected
forms a covalent bond with another atom

Unselected
is an ion

Unselected
gains or loses a proton

Unselected
gains or loses a neutron

1 answer

When the proton number and electron number are unequal, the atom or molecule is an ion.