Read the list of elements given below. Be, Mg, Ca, Sr Which of the following about the elements is true? All of them are unreactive metalloids. All of them are hard and dense metals. Be and Mg are hard and dense metals and Ca and Sr are unreactive metalloids. Be and Mg are unreactive metalloids and Ca and Sr are hard and dense metals
Answer is: all of them are hard and dense metals. Beryllium, magnesium,calcium and strontium are alkaline earth metals. The elements have very similar properties. Alkaline earth metals have in common an outer s- electron shell (two electrons). Strontium has greatest density of this four elements.
