Practice!

Sample Problem

Which of the following descriptions correctly characterize the properties of alkali metals? (Choose all that apply).

Low ionization energy

Not reactive

Tend to lose a single valence electron

React with oxygen in the air

Form cations with +1 charge

Solution

Alkali metals have low ionization energy. They are very reactive and tend to lose a single valence electron. Thus, they form cations with +1 charge. They also react with oxygen in the air.