Question #eda28

1 Answer
Apr 23, 2017

Answer:

Because alumina has a formula of #Al_2O_3#.........

Explanation:

Aluminum is a Group 13 metal, and with 3 valence electrons, and commonly forms an #Al^(3+)# cation. Oxygen is a Group 16 non-metal, with 6 valence electrons, and commonly forms an #O^(2-)# anion. The ions combine so that an electrically neutral material is obtained, i.e. #Al_2O_3#.