Iron, Bromine, Uranium, Argon, ?

Yttrium!

At first I was looking at the atomic numbers, or locations on the table. Then I wrote out the symbols. They were Fe, Br, U, Ar, ? I don’t think it’s a coincidence that it looks like February =) And behold, there is indeed an element whose symbol is Y. Yttrium!

That was fun! Easy, but it’s a difficulty of 1, so it’s expected =) I like how there are a couple different paths to consider when dealing with elements =)