Elementally, it reacts most commonly with hydrogen and oxygen.
But in the forms of ammonia or nitrates, it will react with most
elements.
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Magnesium is one of the more reactive metals; it rarely exists
in nature elementally.
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The noun element has the adjective form elemental. The adverb form is elementally. A related adjective is elementary, which has a connotation of basic or simple. The adverb is elementarily.
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Chlorine elementally? No - that would almost be a contradiction of the nature of chlorine. But chlorine in combination with other elements (chlorine compounds of various types) are implicated in many kinds of cancers.