The outer electronic configuration of alkaline earth metals is:

Which are the important ingredients present in Portland cement?

Match column-$I$ with column-$II$ :

Column-$I$	Column-$II$
$(a)$ Calcium	$(p)$ Crimson red
$(b)$ Barium	$(q)$ Brick red
$(c)$ Strontium	$(r)$ Apple green
-	$(s)$ Yellow

Which of the following carbonates undergoes decomposition upon heating?

The correct order of density in the $IIA$ group (alkaline earth metals) is:

The halides of alkaline earth metals form hydrates such as $MgCl_2 \cdot 6H_2O$,$CaCl_2 \cdot 6H_2O$,$BaCl_2 \cdot 2H_2O$,and $SrCl_2 \cdot 2H_2O$. What does this indicate about the halides of group $2$ elements?