Question

1. which list consists of elements that have the most similar chemical properties or reactivity? o k, ca, and ga o f, cl, br o mg, al, and si o k, al, and ni

Explanation:

Step1: Recall periodic - table trends

Elements in the same group have similar chemical properties.

Step2: Identify groups of given elements

F (fluorine), Cl (chlorine), and Br (bromine) are all in Group 17 (halogens). K (potassium) is in Group 1, Ca (calcium) in Group 2, Ga (gallium) in Group 13. Mg (magnesium) in Group 2, Al (aluminum) in Group 13, Si (silicon) in Group 14. K in Group 1, Al in Group 13, Ni (nickel) in Group 10.

Answer:

F, Cl, Br