Nitrogen naturally occurs as a diatomic molecule (N2).
Nitrogen, by itself, is an element.
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N4Se4 is not a valid chemical formula for any known compound. Nitrogen (N) and selenium (Se) can form various compounds, but N4Se4 does not correspond to any known chemical compound.
PB is an element. It is the chemical symbol for lead.
NH is a molecule composed of nitrogen (N) and hydrogen (H) atoms, not an element itself. Nitrogen and hydrogen are individual elements on the periodic table.
Ag is the chemical symbol for silver, which is an element. It is not a compound.
Hl is an element. It is the chemical symbol for the element helium on the periodic table.