1 Answer | Add Yours
An element consists of atoms each of which have the same number of protons in their nucleus. A chemical element is identified by the number of protons it has, atoms can lose or acquire different number of electrons in an attempt to acquire a stable electron configuration. Atoms of the same element can also differ in the number of neutrons they have.
`CaCO_3` is the chemical symbol for calcium carbonate. This is a chemical compound each molecule of which is made up of one atom of calcium, one atom of carbon and 3 atoms of oxygen. Calcium, oxygen and carbon do not have the same number of protons in their nucleus.
A substance that is made up of only one type of particle, is called a pure substance. The particles that form the substance can be individual atoms or molecules consisting of many atoms. As calcium carbonate has only one type of particle it is a pure substance. It is not an element as the molecule is made up of atoms with different number of protons in the nucleus.
We’ve answered 318,917 questions. We can answer yours, too.Ask a question