Question

What are four elements on the periodic table

Answer 1

There are 92 natural ones and about 20 more made in particle-Physics labs.

If we only stick to the 92 natural ones, then there are

(92!) / (88! times 4!) = 2,794,155 possible answers to your question.

Here's one: Osmium
Neodymium
Iridium
Gold .