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The discovery of an atom by ZL - Coggle Diagram
The discovery of an atom by ZL
Democritus (460BC-370BC)
An atom is something which is so small that it can't be divided or cut any smaller anymore
John Dalton(1766-1844)
Matter is made up of atoms
atoms are the smallest unit of our body
same atoms are divided into similar elements
J.J. Thompson (1856-1940)
discovered electrons which are like a raisin in a plum pudding
known for the plum pudding model
thinks atoms are mostly positive charged
Ernest Rutherford (1871-1937)
nucleus is the centre of the atom
discover protons in nucleus
electron move outside nucleus
known for his gold foil experiment
most Alpha particles manage to pass straight through=gold atoms are mostly empty
some Alpha particles deflected=they pass through near the nucleus
Neils Bohr (1885-1962)
electron in an atom move in shells around the nucleas
James Chadwick (1891-1974)
discover neutrons in nucleus
neutrons contribute almost half of the mass of an atom