Describe Main Postulates Of Dalton Atomic Theory and Rutherfords Atomic Model.
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Answer:
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Explanation:
John Dalton
Postulate 1
All matter is made up of very tiny particles called atom , which participate in chemical reaction.
....Which me every matter has a small small unit for building base which is known as atom
So in any chemical reactions this atoms play the most important roles.
Postulate 2
Atoms are indivisible particles which cannot be created or destroyed in a chemical reaction.
....This atoms are already there but might change into change from one from to another.
Postulate 3
Atoms of a given element are identical in mass and chemical properties.
... As it's is in constant rate that atoms of element and their properties in reaction.
Postulate 4
Atom of different elements have different masses and chemical properties.
...As it is obvious that different people has different masses (weight) and goals so which can be used as a metaphor to atom that atom of different metals or element act as a different way.
Postulate 5
Atoms combine in the ratio of small whole numbers to form compounds
... Asin observation that when 2 hydrogen and 1 oxygen combine together form and compound in this case water.
Postulate 6.
The relative number and kind of atoms are constant in a given compound
... I said before the atoms do not create nor get destroyed so it is said that in a compound the items in that must be constant ( in fixed no.)
So Rutherford was interested in knowing how electrons are arranged in an atom so he decided to do air experiment , which made him to this below conclusion , which is also known as the rutherford's model of an atom
1 ) Most of the fast-moving alpha ( charged helium ) particles pass straight through the gold foil.
.....As they so fast that nothing can be stopped them so we can say that due to the high speed and density they passed the gold.
2) some of the Alpha particles were reflected by the point in a small (acute) angles.
.... In an Atom the protons have high charge so due to this charge the Alpha get deflected.
3) one out of every 12000 particles appeared to be rebound
... It can be only possible if the the Alpha particle collide straight into to the proton at an at an angle which made it deflect completely that it gets rebound..
As I am not a 9 standard student so there might be some mistake in the answer please bare with and if there is any please write in the comments
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