National Science Bee Practice Test

The element with symbol Li is a reactive alkali metal. Which option correctly identifies it?

Sodium Lithium Potassium Rubidium

Correct Answer:

Lithium

Explanation:

Recognizing the symbol Li points directly to lithium, which is in Group 1, the alkali metals. Alkali metals are highly reactive and have one electron in their outer shell, which explains their vigorous reactions. Lithium is the lightest of these metals and has widespread uses in batteries. The other common alkali metals have different symbols—sodium is Na, potassium is K, and rubidium is Rb—so they do not match Li.

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