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Two or more elements chemically combined form a compound.
A compound.
a compound
Gold nitride. It is not known whether this compound exists. A compound called gold nitridehas been formed on the surface of gold samples and this MAY be Au3N
There are some elements that can't become a compound but can become a mixture. OK your question is not completely understood. A compound is made up of 2 or more elements that are chemically combined and can only be separated by chemical means. A compound is formed in a chemical reaction. A mixture is 2 or more substances (it doesn't have to be elements) that are phsically combined and can only be separated by physical means. So the answer to your question is not open because your question should be some thing like "Which element(s) does not actively combine with other elements in a compound or mixture?" The answer to that question would be many. Some elements can't come together to form a compound but they can form a mixture perfectly and visa versa.Ans 2. The above answerer has not fully understood the question. The word "combine" defines "a compound" and excludes "a mixture". The phrase "actively combine" refers to those elements which show no spontaneous inclination to combine with any other. These elements were long referred to as "inert", but the name has recently been changed to"noble gases". The reason for their dis-inclination to combine is that in every case the atom's outer electron shell is full; in other words their valency is zero.
Elements are not mixtures of anything. An element contains only atoms of that elements and nothing else. A compound contains two or more elements which have been chemically combined to create a new substance with different chemical and physical properties to the elements from which it was formed.
compound
When two or more elements form a bond, they do so either by sharing electrons, or by one element donating and one element accepting electrons. In the former case, you have a covalent bond. In the latter case, it is an ionic bond.
A substance made of two or more elements that have been chemically joined is called a compound.
The answer is compound.
It is a Compound.
Two or more elements chemically combined form a compound.
compound
A compound.
a compound
An example of how two elements changed properties when they formed a compound can be found in table salt, sodium chloride. Sodium by itself is very unstable, exploding when it comes into contact with water, and causing burns if it contacts skin. Chlorine is a gas that is so poisonous that it has been used as a chemical weapon, but together, sodium chloride is necessary for life. It also makes french fries better!
If two or more elements have been mixed together, it is called a mixture. However, if a chemical reaction occurred, then it is called a compound.