Question

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

• A. The valency of element is $7$
• B. The element exists as a triatomic molecule
• C. The element is metalloid
• D. The element forms basic oxide

Answer 1

Answer: (D)

Electronic configuration indicates that $1e^{-}$ is presen in outermost shell.

It will easily lose electrons

$\therefore$ It is metal and form basic oxide

$2Na+\frac{1}{2}{O}_2\to N{a}_{2}O$