Question

An atom of an element has an electronic configuration 2, 8, 1. Which of the following statement is correct?

Options

• The valency of the element is 7.

• The element exists as a triatomic molecule.

• The element is metalloid.

• The element forms basic oxide.

Answer 1

The element forms basic oxide.

Explanation:

Electronic configuration indicates that 1 e⁻ is present in the outermost shell.

It will easily lose electrons.

∴ It is metal and forms a basic oxide.

\[\ce{2Na + 1/2O2 -> Na2O}\]