use the periodic table to choose the element that matches each description. halogen: group iia: nonreactive…

Explanation:

Step1: Recall halogen group

Halogens are in group 17 of the periodic - table. Common halogens are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).

Step2: Recall group IIA elements

Group IIA elements are alkaline - earth metals. They include beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).

Step3: Recall non - reactive elements

Noble gases in group 18 are non - reactive due to their full outer electron shells. They include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).

Step4: Recall alkali metal group

Alkali metals are in group 1 of the periodic table (excluding hydrogen). They include lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).

Answer:

halogen: Fluorine (or other halogen elements like Cl, Br, I, At) group IIA: Magnesium (or other group IIA elements like Be, Ca, Sr, Ba, Ra) nonreactive: Neon (or other noble gases like He, Ar, Kr, Xe, Rn) alkali metal: Sodium (or other alkali metals like Li, K, Rb, Cs, Fr)