Hi 👋 guys in this blog let's learn about what is atom, gas, element, molecules and three states of matter. 
What is an atom ?
The term atom comes from the Greek word atomas meaning in divisible earlier it was considered that atoms were the smallest unit of a substance and could not be split further today we know that atoms can be further split into smaller particles and atom is made up of atomic nucleus which consists of positively charged protons and an equal number of neutrons and atomic shells these are occupied by negatively charged electrons which move at high speed around the atomic nucleus like planet around the sun. 
What is an element ?
An element is a pure substance consisting of atoms of the same kind elements cannot be broken down into simplar substance but they can combined with other elements to make new substance each elements has a unique symbol for example "O" means oxygen "Na" means sodium and "Cl" means chlorine the number of protons in the atomic nucleus determines the element this number is called the atomic number of the elements. 
What is molecule ?
A molecule consist of two or more atoms which are held Together by chemical bonds a water molecule is made up of two atoms of hydrogen h and one atom of Oxygen does the chemical formula of water is H2O elements also frequently occurs in molecular forms for example to items of chlorine Oxygen and nitrogen combine to form cl2 O2 and N2 respectively there are complicated molecules as well  such as those of plastic. 
What is a gas ?
A gas is one of the three status of matter in a gas the forces that blind its elements together or not as strong as those in liquids or solids forces or not to be confused with the forces of attraction within the molecules there are transitions between the state matters for instance waxes solid at room temperature melts when a candle is Lit and evaporates at a very high temperature the 4th state of matter rally found on the earth is Plasma in this state the matter is ionized and conduct electricity. 
The three States of matter are given as follows :
1. liquid ( molecules or loosely packed )
2. Gas ( molecules are very loosely packed ) 
3. solid ( molecules or tightly ) That transmission from one state to another is known as evaporatio
1.condensation
2. melting
3. freezing
4. sublimation
5. resublimation

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