What Is an Atom Chemical Formula and All About Atom

             What Is an Atom Chemical Formula 

                    and All About Atom

An atom is defined as the smallest particle of an element that can exist.Atom are the building blocks of all matter.Atom are made up of positively charged particles called protons and negatively charged particle called electrons and neutral particles called neutron. 

CONCEPT OF DIFFERENT PHILOSOPHERS ABOUT ATOM:

For many years, people wondered how matter is made up of.GREEK PHILOSOPHER believed that all matter was made up of four substances,namely earth,water,air,fire.ANCIENT CHINESE PHILOSOPHER believed that matter was made up of gold,wood,water,fire and earth.GREEK PHILOSOPHER named Democritus suggested that matter was made up of indivisible particles called atom.This came from Greek word "atomos" meaning "indivisible".He believed nothing could be smaller than an atom.However scientific experiment show that all matter is indeed made up of atoms.However they are different from DEMOCRITUS thought them to.

WHAT IS AN ATOM:

An atom is defined as the smallest particle of an element that can exist.Atom are the building blocks of all matter.All matter,living or nonliving,is made up of atoms.Atoms are so small that you cannot see them with an electron microscope.The atoms of different elements are different in sizes.

CONSIST OF:

Atom are made up of positively charged particles called protons and negatively charged particle called electrons and neutral particles called neutron.

Circles of various sizes and different symbols are used to represent atoms of different elements.

A chemical formula shows the number and kinds of atoms contained in each molecule.

FOR EXAMPLE:

1) Chemical formula of water is :H2O

Each molecule of water contains two ATOMS of hydrogen and one ATOM of oxygen,chwmically combined together.

2)How many atoms make up one molecule of chlorine gas,CL2 ?

Answer: Two atoms of chlorine (Cl2) 2 shows that their are two atoms in one molecule of chlorine