Grains, which has the most iron, calcium, zink and selenium?

I have found the results for Norwegian grains per 100 grams.

Oats are very high in calcium and iron. 53 and 5 mg.
Wheat are on second place with 31 and 4,1 mg.
Barley has 27 and 2,2.
Spelt has 25 and 2,9.
Rye has 24 and 2,8.
Corn has 6 and 1,1.
Rice has only 6 and 0,1 mg and has the lowest amount and are a good staple food for men who don't need the high amount of iron as young women do.

Big differences as you can see.

So what about zinc and selenium?

Wheat are on top regarding selenium. 10 mg.
Rye are on second place with 6mg.
Rice has 5 mg.
Barley has 3, corn has 2 and oats 1 mg.

There are not big differences between the grains when it comes to zinc content.
Spelt and oats are on top with 3,1 mg, wheat and rye are on second place with 2,7 and 2,2.
Barley and corn has 1,5 mg and rice has only 0,5.

Copper content is interesting too, but I look for the lowest amount,ot the highest then, because many women has too much copper in the diet and the body.( https://metabolichealing.com/birth-control-copper-toxicity-estrogen-excess/)

Rice is lowest in copper, with only 0,09 mg.
Corn has 0,14, rye 0,27 and wheat has 0,35 mg.
Spelt and oats has 0,4 mg and barley has 0,56 mg.