The compounds of alkaline earth metals have the following magnetic nature:

Which of the following pairs is chemically dissimilar?

Which of the following alkaline earth metals shows some properties similar to aluminium?

Alkaline earth metals are denser than alkali metals because metallic bonding is:

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: Barium carbonate is insoluble in water and is highly stable.
Reason $R$: The thermal stability of the carbonates increases with increasing cationic size.
Choose the most appropriate answer from the options given below for $A$ and $R$.

Explain the chemical properties of alkaline earth metals (Group $2$) in detail.