There is no such thing as a pure race. Every race on Earth has combined with one race or another throughout history. So, it would be untrue to describe any one race as pure.
most noble gases exist in their pure form because they are so unreactive
No, it does not exist naturally in its pure form. Itexists in the combined form.
silver
These elements exist as compounds.
Some elements that are not chemically combined with any other substance exist as single atoms. Pure copper, pure lead, pure silver. Oxygen does not, the pure state of oxygen is a diatomic molecule, O2.
The two major myths of race are that race is a biological, rather than a social construct, and that there are distinct and pure racial categories. These myths have been debunked by scientific research showing that race is a social concept with no basis in genetics.
There is no scientific proof that alien races exist in the universe so we have no idea what they might look like if they did exist.
If alien races do exist, they could possibly have hermaphrodite characteristics.
Alien races could possibly have elf characteristics if they do exist.
If alien races do exist, they could possibly have green blood.
If alien races exist, they could possibly have black blood.
If alien races do exist, they could possibly have orange blood.
If aliens exist, the alien races may have mammavian characteristics.
Some alien races, if they exist, may have five arms.
If aliens exist there could be some alien races that have reptavian characteristics.
If alien races exist, there may be a chance that they could be centauroid in shape.
Yes it is available in its pure form