Question

The reaction of aluminum metal with oxygen gas typically produces the product with the formula A) Al2O B) Al2O3 C) Al3O2 D) AlO

Answer 1

Answer: The correct answer is $Al_2O_3$

Explanation:

Aluminium is the 13th element of the periodic table with electronic configuration of $1s^22s^22p^63s^23p^1$

This element looses 3 electrons and shows an oxidation state of +3.

Oxygen is the 8th element of the periodic table with electronic configuration $1s^22s^22p^4$

This element will gain 2 electrons and shows an oxidation state of -2.

By criss-cross method, the oxidation state of aluminium and oxygen gets revered and they form the coefficients of the compound.

Hence, the compound formed will have the chemical formula of $Al_2O_3$

Answer 2

B because Al is +3 and O is -2