Question

which set of elements has the most similar physical and chemical properties? h li be na mg k ca rb sr cs ba fr ra a. k, sr, li b. k, ca, rb c. k, cs, fr d. k, ca, sr

Explanation:

Elements in the same group of the periodic table have similar physical and chemical properties. Potassium (K), Cesium (Cs), and Francium (Fr) are all in Group 1 (alkali - metals). They have one valence electron, which gives them similar chemical reactivity and some similar physical properties like being soft, having low melting points, and being highly reactive with water.

Answer:

C. K, Cs, Fr