A metal and a non metal. Two non metals. A metal and a metalloid.
For example metals can react with metals.
No, they will not react when put together. This is because both calcium and copper are electropositive metals. No two electropositive elements or electronegative elements react under normal conditions.
They form a compound.
You get two or more compounds.
When they react with one another.
because they are chemically joined together and it is difficult to separate them
a conboltable element
When two elements chemically react, the mass of the product is equal to the sum of the two masses of the two elements.
Two or more elements react now to improve the above answer when two or more elements (doesnt matter if they ere isotopes or not) come together that is when a compound is made . Compounds could be broken down but elemants can NOT,
The two undiscovered elements A +1 and D +2 would not react. These elements would prefer to react with elements B -1 or C -2.this a gay comment
Francium and Fluorine. They would react instantaneously and explosively. However, this would never be done in an open lab. , because francium is radio-active. However, Sodium (Grp (I)) and Chlorine (Grp(VII)), will react in a gas jar in the lab. But less vigorously than the above two.
If they have no physical contact they likely will not react in any way.
If two elements are joined together it is a compound