Question

which of the following groupings contains only representative elements?
ni, fe, zn
al, mg, li
cu, co, cd
hg, cr, ag

Explanation:

• Representative elements are elements in groups 1, 2, and 13 - 18 of the periodic table.
• \(Ni\), \(Fe\), \(Zn\), \(Cu\), \(Co\), \(Cd\), \(Hg\), \(Cr\), \(Ag\) are transition metals (groups 3 - 12).
• \(Al\) (group 13), \(Mg\) (group 2), \(Li\) (group 1) are representative elements.

Answer:

Al, Mg, Li