difference between atom,particles, molecules and compound

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difference between atom,particles, molecules and compound

Atoms:-

All the matter in the universe is made of tiny particles called atoms. There are 92 different kinds of atoms in nature. These 92 different atoms combine with one another to form different kinds of matter that we see in nature.

Molecule:-

A molecule is the smallest unit of a chemical compound and it exhibits the same chemical properties of that specific compound. As molecules are made up of atoms jointly held by chemical bonds, they can vary greatly in terms of complexity and size. The oxygen we breathe has a molecular formula O2. Should we consider this as an element or compound? When two or more atoms of the same elements combine together, we call them Molecules. So, we call O2 as an oxygen molecule. In the same way, we find hydrogen molecules H2, chlorine molecules Cl2 and others in nature.

Compound:-

The chemical formula of water is H2O. Observe that, water is made of two hydrogen atoms and one oxygen atom. Here, two different elements, hydrogen and oxygen combine, giving rise to a new substance called water. Such substances, which are made by the combination of two or more kinds of elements are called Compounds. The atoms in a compound are chemically bonded and hence cannot be separated easily. Similarly, the chemical formula of carbon dioxide is CO2 and it is made up of two elements, carbon, and oxygen. Some other examples of compounds are table salt (NaCl), chalk (CaCO3)and water (H2O).

Particle:-

“Particles” can mean atoms (He gas atoms), molecules (H2 gas, N2 gas molecules), ionic substances (NaCl ionic salt) or even the ions itself (Chloride Cl- anions, Mg2+ cations).

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