Question

lithium, sodium, and potassium are examples of ______. a non - metals b alkali metals c transition metals d alkaline earth metals

Explanation:

Lithium (Li), sodium (Na), and potassium (K) are in Group 1 of the periodic table. Elements in Group 1 are known as alkali metals. Non - metals are elements that lack metallic properties, and these three are metals, so option A is wrong. Transition metals are in the d - block of the periodic table, while Li, Na, K are in the s - block, so option C is wrong. Alkaline earth metals are in Group 2 of the periodic table, so option D is wrong.

Answer:

B. alkali metals