Which of the following is an element?
Acarbon monoxide gas (co)
Bmagnesium chloride salt (mgcl)
Chydrochloric acid (hcl)
Dzinc metal (zn)
Acarbon monoxide gas (co)
Bmagnesium chloride salt (mgcl)
Chydrochloric acid (hcl)
Dzinc metal (zn)