What is the formula of rubidium?

Answer 1

We know from the -ide on flouride that this compound will be an ion. So we look to cross the charges of the common ions of Rb and F

Rubidium exclusively forms a 1+ ion, since it is an alkali metal, and fluorine forms a 1- ion exclusively. Therefore Rb+ + F- => RbF

Answer 2

Rb+1 Br-1 ----> these are the ions and their charges

RbBr -----> the charges have to add up to zero, so one +1 Rb ion cancels out one -1 Br ion

RbBr ----> final answer

Answer 3

Rb

It is a simple element

Answer 4

The chemical formula of rubidium is Rb.