screening and evaluation
It refers to any two or more elements which have been combined naturally.
If there are two or more elements or compounds physically combined, then it can no longer be an element.
compound
Two or more elements combined can become a compound.
Two or more elements chemically combined form a compound.
The elements are: two hydrogen atoms and one oxygen atom. Combined they form water (H2O).
compound
Compound
Two elements, namely hydrogen and oxygen
two or more elements and/or compounds that are physically combined.
they are two or more elements that are chemically combined
Yes. That is what a compound is: two or more chemically combined elements.