Question

predicting characteristics by metal type. use the periodic table to locate lithium, barium, and cobalt. match the element with the correct description. lithium, barium, cobalt, forms colorful compounds, has 2 valence electrons, is most reactive

Explanation:

Step1: Analyze lithium properties

Lithium (Li) is an alkali - metal in Group 1. Alkali - metals are very reactive and have 1 valence electron. Lithium is the most reactive among the three given elements in terms of its position in the periodic table and group properties.

Step2: Analyze barium properties

Barium (Ba) is an alkaline - earth metal in Group 2. Alkaline - earth metals have 2 valence electrons.

Step3: Analyze cobalt properties

Cobalt (Co) is a transition metal. Transition metals often form colorful compounds due to the presence of partially filled d - orbitals.

Answer:

Lithium: is most reactive
Barium: has 2 valence electrons
Cobalt: forms colorful compounds