Molecule of an element means the element consists identical atoms that makes a molecule. For example: Hydrogen. In hydrogen two hydrogen atoms combine to form molecule of the Hydrogen element.

Molecule of a compound : When two or more different kinds of atoms from different element combine to form a compound then we say them as molecule of a compound. For example : when Hydrogen and oxygen reacts to form water, we say that it is a one molecule of water.

Introduction

Molecules are the smallest units of a substance that retains its chemical properties. They are formed when two or more atoms chemically bond together. Molecules can be classified into two categories: molecules of elements and molecules of compounds. The main difference between these two types lies in the composition of the atoms within the molecule.

Molecule of an Element

A molecule of an element consists of two or more atoms of the same element chemically bonded together. In other words, it is a pure substance composed of identical atoms. Elements are made up of only one type of atom, and elements themselves are represented by symbols on the periodic table.

Example: Oxygen Molecule (O₂)

One example of a molecule of an element is the oxygen molecule (O₂). It is composed of two oxygen atoms chemically bonded together. Oxygen is an essential element for life, and it exists as a diatomic molecule in its standard state. The oxygen molecule is stable and plays a crucial role in various biological and chemical processes, such as respiration and combustion.

Molecule of a Compound

A molecule of a compound consists of two or more different types of atoms chemically bonded together. Compounds are substances formed when elements combine in fixed ratios through chemical reactions. Unlike elements, compounds have distinct chemical properties that differ from their constituent elements.

Example: Water Molecule (H₂O)

One example of a molecule of a compound is the water molecule (H₂O). It is composed of two hydrogen atoms and one oxygen atom chemically bonded together. Water is a vital compound for life, and its unique properties stem from its molecular structure. The oxygen atom attracts electrons more strongly than the hydrogen atoms, resulting in a polar molecule with partial positive and negative charges. This polarity allows water to form hydrogen bonds, which contribute to its high boiling point, surface tension, and ability to dissolve various substances.

Conclusion

In summary, the main difference between a molecule of an element and a molecule of a compound lies in the composition of the atoms within the molecule. A molecule of an element consists of identical atoms bonded together, whereas a molecule of a compound consists of different types of atoms bonded together. The oxygen molecule (O₂) serves as an example of a molecule of an element, while the water molecule (H₂O) exemplifies a molecule of a compound. Understanding the distinction between these two types of molecules is essential in comprehending the diverse nature of matter and its chemical properties.