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1. Atoms

   • Smallest particle Cannot be broken down further Scanning tunelling microscope gives us 3d look of electrons 

2. Atoms

   • Smallest particle Cannot be broken down further Scanning tunelling microscope shows 3d electrons 

3. Atomic theroies

   • Early greeks-Atoms building blocks of matter J.J Thomson-Negative electrons embedded in sea of positve of charge Ernest Rutherford-Positive elecrtons in central nucleus Neils Bohr-Electrons orbit in circular orbit with quantized charge Quantum Mechanics- Atoms are n different regions whose shape described threw mathemetical equations 
   • Daltons Atomic theory: 1.Element composed of extremely small particle-Atoms 2.Atoms of given element identicla but atoms of one element different from all other atoms of elements 3.Atoms of one element not changed from atom of another element threw chemical reactions.  Atoms neither created nor destroyed in chemcal reaction\ 4. Compound fromed when more than one element combined and given compound has same relative number and kind of atoms
   • Models JJ Thomson: Plum pudding Model- Negatively charged electrons surronded y positivly charged Ernest Ruherford Gold Foil Experiement Discovred theat atom mostly empty space and contains positively charged electrons  Neils Bohr Electrons do not move randomly Move in specific layers or shells Electrons moves one sheel above or below give or take energy

4. Strucutre of atom

   •     The structure of the atom Atoms contain three sub-atomic particles called protons    
   • Stucture of atom Contains three sub atomic particles Protons: Postively charged particles found in nucleus of atom Electrons: Negatively charged small aprticles found in space around nucleus Protons and neutrons found in nucleus centre of atoms Nucleus very small Electrons found in energy shells near nucleus
   • Properties of sub atomic particles
     • No. of electrons always same as no.of protons They can loose or gain electrons when they loose one or more electrons atom becomes postively charged ion When they gain one or more electron they become negaively charged ion

5. Isotopes

   • Isotopes are atoms of an elemnet with different no.of neutrons but same no.of proton but different mass number