Question

A substance that is combined in a molecule of an element. ( Answer in a word/ a few words. )

Answer 1

The element is defined as the simplest chemical substance in which only one type of atoms are arranged definitely. It is considered as the species of the atoms which contains the same number of protons in its atomic nuclei. But when the atom of the same element has a difference in its number of neutrons then it is called isotopes. The element cannot be divided into several substances.

Complete step-by-step answer:
When a substance is formed by the combination in a molecule of an element then it is called a compound. The compound is considered as the substance which is made up of two or more types of elements with a specific and a definite ratio. There are two types of compounds. The one is, the molecular compounds in which the atoms are bonded to each other by the covalent bonds.

The other form of compound is salts in which the atoms are bonded to each other by the ionic bonds. The example for molecular compounds will be water. It says that the compound contains two atoms of hydrogen and one atom of oxygen. The example of salt is NaCl. In this there is one atom of sodium and one atom of chloride.

Note: For the chemical combination of the elements we have some laws. They are the law of conservation of mass which states that matter cannot be created and nor be destroyed. The other is a law of definite proportions which states that the proportion of the element by weight in the compound will always remain the same. The other is the law of multiple proportions which says that if more than two elements are there in the compound then the elements will be in small ratio.