The most small but complex structure,which give rise to every material is the atom.An atom is very complicated in its structure but it is the fundamental concept of life and elements and every material.
It is very small in its size,its size is about 0.2 nm.We can just imagine that a single full stop consist of about 2 million atoms.It can't be observed by humans eye neither by an ordinary eye microscope,but in order to study the structure of an atom we need to use an electron microscope which throws beams of electrons instead of light as the wave length of electrons is smaller then light so we can clearly identify its structure.An atom is further composed of electron,proton,neutron,hypron,neutrino,anti-neutrino etc.More then 100 such particles are thought to be existing in an atom.Further different atoms consist of dirrerent atomic masses and different atomic numbers.The atomic number and atomic masses depends upon the total number of proton and neutron present in an atom.
Every material thing in this universe are of the composition of atoms.Water which covers about 75% of the earth surface also is composed of hydrogen and oxygen which is bonded by a covelent bond.
It is very small in its size,its size is about 0.2 nm.We can just imagine that a single full stop consist of about 2 million atoms.It can't be observed by humans eye neither by an ordinary eye microscope,but in order to study the structure of an atom we need to use an electron microscope which throws beams of electrons instead of light as the wave length of electrons is smaller then light so we can clearly identify its structure.An atom is further composed of electron,proton,neutron,hypron,neutrino,anti-neutrino etc.More then 100 such particles are thought to be existing in an atom.Further different atoms consist of dirrerent atomic masses and different atomic numbers.The atomic number and atomic masses depends upon the total number of proton and neutron present in an atom.
Every material thing in this universe are of the composition of atoms.Water which covers about 75% of the earth surface also is composed of hydrogen and oxygen which is bonded by a covelent bond.
Group of atoms are known as molecules.Further atoms changes into ions either positive or negative ion when it losses or gain electrons respectively.Every atom has its own isotopes,upon the concept of isotopes it is arranged in a proper order in a periodic table.A periodic table concept was first given by Mendleev.
An atom can be further broken down in order to obtain energy.Atomic energy can also be used in atoms bombs.I t is in our choice either to use it for good purpose or bad.
In short atom is the fundamental basis of life.. 
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