Strontium can be a neutral atom or a cation.
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Strontium is a cation because it has a positive charge. Specifically, strontium typically forms a +2 cation when it loses two electrons.
The chemical formula for strontium and nitrogen is Sr3N2.
anion
Anion is a negative ion (Cl-) and cation is a positive ion (Na+).
AgNO3 consists of the cation Ag+ and the anion NO3-. Ag+ is the silver cation, while NO3- is the nitrate anion.
Boron is an element and is neither an anion or cation. If ionized it would tend to from B3+ and would be thus a cation.