Snemalna Knjiga Besedilo
- DEMOCRITUS (430 B.C.)
- Democritus's model was just a small sphere, nothing in it. He concluded that matter is made of very small spheres known as, ATOMS. He also told that atoms are undivisible and uncuttable.
- Oh! So this is what matter is made up of!!
- Dalton's atomic theory stated that atoms can neither be destroyed nor created. His theory also proposed that atoms of same element are same but of different element are different. He also told that atoms take part in chemical reactions. He pictured atoms as billiard balls.
- DALTON (1808)
- There are lots of different kinds of atoms!
- nice, electrons travel in different orbits.
- Thomson discovered electrons and protons. He compared his model to plum pudding model, positively charged pudding and negatively charged plums. Atom is neutral as net positive charge approaximately equal to net negative charge..
- J.J THOMSON (1897)
- Oh, So atoms also have protons and electrons!
- Oh! everyone was wrong, It also has neutrons!!
- RUTHERFORD (1911)
- The model described the atom as a tiny, dense, positively charged core called a nucleus, in which nearly all the mass is concentrated, around which the light, negative constituents, called electrons, circulate at some distance, much like planets revolving around the Sun.
- Amazing! atoms also have a nucleus
- The Bohr model shows the atom as a small, positively charged nucleus surrounded by orbiting electrons. Bohr was the first to discover that electrons travel in separate orbits around the nucleus and that the number of electrons in the outer orbit determines the properties of an element.
- NEIL BOHR (1913)
- James Chadwick discovered that atoms consisted not only of protons and electrons but also neutrons. Chadwick discovered the neutrons, which have approximately the same mass as a proton. Neutrons occupy the nucleus of the atom.
- CHADWICK (1932)
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