Question

An element with atomic number ______ will form a basic oxide.

Options

• 7 (2, 5)

• 17 (2, 8, 7)

• 14 (2, 8, 4)

• 11 (2, 8, 1)

Answer 1

An element with atomic number 11 (2, 8, 1) will form a basic oxide.

Explanation:

Metals form basic oxides with 1 to 3 electrons in their outermost shell, whereas nonmetals form acidic oxides with 4 to 8 electrons in their outermost shell. As a result, metal (Na) with atomic number 11 (electronic configuration 2, 8, 1) will produce basic oxide.