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The element Aluminum, as well as the IA and IIA metals, (combine / combines) explosively with oxygen under the right conditions.

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The element Aluminum, as well as the IA and IIA metals, (combine / combines) explosively with oxygen under the right conditions.

combines

The "as well as" phrase is an additive phrase, not part of the subject. The subject is "the element Aluminum" only: as this is singular, we need the singular verb.

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The element Aluminum, as well as the IA and IIA metals, (combine / combines) explosively with oxygen under the right conditions.

The element Aluminum, as well as the IA and IIA metals, (combine / combines) explosively with oxygen under the right conditions.