Question

Should strontium have similar chemistry to calcium OR rubidium?

Answer 1

Calcium -- Alkali Earth Metal

Explanation:

So, it will be less reactive compared to an element like Rubidium and is much more like Calcium as they are both in the Alkali Earth Metals group (2)

It will be more reactive than calcium // for a fun fact <3

Answer 2

If only there were a Table that listed the chemically similar elements in vertical columns.....

Explanation:

But of course there is such a `"Periodic Table"`, in which elements with the same number of valence electrons are listed in COLUMNS....

Strontium comes from Group 2 of the Periodic Table, the so-called alkaline earths, of which calcium is also a member. Calcium and strontium should be chemically similar. On the other hand, rubidium comes from Group 1 of the Periodic Table, and is an alkali metal. Rubidium should be much more reactive chemically.