If sodium iodide and calcium are mixed together, what are the resulting products?
I don't think that there would be any reaction occuring.
Reactivity series of the metals indicates that whether a metal or compound of it will react with another metal compound or metal
(I don't mean that two metals will react with each other!).
But there is a confusion here.
Some say that Sodium is more reactive than Calcium.
See it here : Reactivity Series : BBC Bitesize
Other people say that Calcium is more reactive than sodium.
See it here : Why Calcium is more reactive than sodium
In My opinion, Na (Sodium) is more reactive than Ca(Calcium), and Sodium is the one which has formed the compound before. So it will not leave the compound and come into its free state.
Hence proved my answer.