A metal, M, forms an oxide compound with the general formula M2O. In which group on the Periodic Table could metal M be found?
(1) Group 1 (3) Group 16
(2) Group 2 (4) Group 17

2 Answer

  • Because the compound has a formula of M2O, the number of valence electrons of M should be 1. 

    Therefore, (1) Group 1 is the correct answer because elements in group 1 have 1 valence electron.

    Hope this helps~

  • a. group 1 (the metal has a +1 charge and the nonmetal (O) has a -2 charge, switch them and you'll see that the metal (M) belongs to group 1).