Both have similar number of proton as well as different number of neutron and electron.
The particle composition of nitrogen atom and two nitrogen ions are similar because both have present same atomic number i.e. 7 as well as number of proton i.e. 7 while on the other hand, nitrogen atom and two nitrogen ions have differences such as both have different number of neutron and electron as well as charges on it.
Nitrogen atom has 7 electrons but the nitrogen ion which have negative charge has 10 electrons whereas nitrogen which has positive charge has 4 electrons in its shell so we can conclude that both have similarities i.e. number of proton as well as differences i.e. number of neutron and electron.
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