Question

which of the following elements can be described as having two valence electrons, being highly reactive, and forming basic solutions based on its family in the periodic table? ai rb be mg ba

Explanation:

1. Valence - electron analysis: Elements in Group 2 (alkaline - earth metals) have 2 valence electrons. Al is in Group 13, Rb is in Group 1, so they can be excluded. Be, Mg, and Ba are in Group 2.
2. Reactivity and basic - solution formation: Reactivity of alkaline - earth metals increases down the group. Beryllium (Be) has a relatively stable electron configuration due to its small size and high effective nuclear charge, and is less reactive compared to the heavier members. Magnesium (Mg) is reactive but not as reactive as barium (Ba). Barium (Ba), being a heavier alkaline - earth metal, is highly reactive and its oxides form basic solutions when dissolved in water.

Answer:

E. Ba