Atoms

Hello everybody, this is.. a junior scientist(I call my self a scientist because science is subject I like the most!)
Today I am going to tell you about atom and molecule. Many people might think different about atom and molecule because they seem hard. Well, that is what I felt about when I first started to learn. To me, things I can't see wheather they are so small or so huge, I had a hard time with those to learn including atoms and molecules. But guess what? It is not even hard for now.
What I am going to tell you is History of atom, structure of atom, about periodic table, and  molecule.

History of Atom

People I am going to talk about is pretty famous by having opinion of the sources of the world. Democritus is the first person mentioned about atom. These people is in chronological order.

Thales(B.C 640~546):

Water is the source of all things

Anaximandros(B.C 585~525):

Air is the source of all things

Empedocles(B.C 490~430):

Water, fire, breath, soil

Democritus(B.C 460~370):

Atom is source of everything

John Dalton:

 In 1800's John Dalton refined the idea with his theory that atoms are the smallest particle of an element that retain its chemical properties. For example, if you break apart and atom of an element like , its not carbon anymore. If you want to study atoms, you must remember Dalton!

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Boyle(1700's):

everything is made up of elements that can't be divided anymore

Lavousier(end of 1800's):

defined atom as substance that cannot be divided any more, and presented 33 types of elements

*Structure of Atom

Ø  Nucleus      Protons: (+)electrical charge                                        Neutrons        Ø            Electrons: (-)electrical charge

Rule of Octet= regulation of electrons’ regulation

 Atoms are made up of tinier subatomic particles called protons, neutrons, and electrons.The atom's center, nucleus is a cluster of protons and neutrons. Protons have a positive electrical charge, and neutrons have no electrical charge.

The atoms nucleus is held together by the strong force, which keeps protons from repelling each other. The nucleus is surrounded by a cloud of electrons moving  near the speed of light (3.0×108m/s)

The electrons have a negative electrical charge that attracts them to the protons and they live in shells representing different energy level.

On the Periodic table, atoms are arranged by their atomic number, which is really their number of protons or electrons. 

Periodic Table

Molecule

Atoms can bond together to make a molecule. Molecule can be formed by having same types of atoms like, O₂or H₂. Molecules can also be formed by having different types of atoms like H2O .
Concept of molecule exist at the form of gas or sloppy liquid, but it is hard to appoint clearly in the form of solid.