Draw the time line of history of atomic model
Answers
A Timeline on Atomic Structure. 400 B.C. Democritus' atomic theory posited that all matter is made up small indestructible units he called atoms. ... 1803 John Dalton proposed that elements consisted of atoms that were identical and had the same mass and that compounds were atoms from different elements combined together.
"""Time line of history of atomic model:
450 BC - Empedocles suggested that four basic substances exist: EARTH, WIND, FIRE and WATER.
400 BC- The atomic theory of Democritus stated that all matter consists of small units called atoms that can not be destroyed. The model of Democritius is the earliest model written down by the atomic model. He was the first to use the term """" atom. """"
384 BC- 322 BC--- Aristotle was that all matter consisted of the four elements (fire, water, earth and wind).
1800 - The atomic theory of John Dalton stated that elements consist of tiny particles called atoms and that all element atoms have the same characteristics.
He further stated that compounds are elements that are combined. He suggested a system of symbols representing atoms of various elements.
1869 - The periodic table was created by Dimitri Mendeleev. His table was arranged in an ascending order of atomic weight.
1897- The mass to charge ratio was calculated by J.J Thompson. The electron was also part of the matter. He also introduced the structure of Plum Pudding model of an atom.
1905 -Phillip Lenard has produced a revised atomic model, which states that each atom has positive and negative particles.
1909 - Ernst Ruderford revised theory of Phillip Lenard. And confirmed the nucleus is positively charged and was empty in the middle of the atom and the rest of the atom with the electrons around it.
1922- Neils Bohr added to the atomic model that the electrons ' The model of Neils Bohr is very similar to the modern atomic model.
Present - The modern atomic model states that the nucleus in which protons and neutrons reside is the center of the atom.
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