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How the Model of the Atom has changed over Time

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Nicole N Reyos

on 13 September 2013

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Transcript of How the Model of the Atom has changed over Time

How the Model of the Atom has changed over Time
Demoncritus
Made his discovery in 450 B.C.
His model was accurate that matter consisted of tiny particles called atoms
His model was inaccurate, because he thought matter and shapes could not be divided they were uncuttable
John Dalton
Made his discovery in 1800
His model was accurate, because he joined wooden balls together to show that atoms form compounds. His model was circular, smaller + unit of matter
His model was inaccurate because the wooden balls he used as atoms he thought were solid and the smallest particles of matter. it didn' t show sub-atomic, there is no electrons, no empty space, and no movement.
Summary of Dalton's atomic Theory
All substances are made of atoms, and are the smallest particles of matter
Atoms cannot be divided, created or destroyed.
Atoms of the same element are the same, have the same mass atoms of different atoms have different mass
Atoms join together to form compounds that have the same atoms and same ration.

J.J. Thomson

Made his discovery in 1897
His Model was accurate, because he "discovered" electrons. His model showed how there is negative electrons, and positive protons, which he believed made a "neutral" charge.
His Model was in-'accurate, because he didn't have a nucleus. Which is a positively charged center with electrons surrounding the center, but his model has them together, There is no movement, and no neutrons
Ernest Rutherford
Made hi discovery in 1899
His model was accurate , because he discovered that that atoms have a nucleus that is positively charged that he named protons. He showed the charges sub-atomic particles, It showed most the mass of an atom is in the nucleus, shows the electrons orbit the nucleus.
His model was in-accurate, because he didn't discover electrons orbit the nucleus along certain paths, he thought electrons just grouped around the nucleus. His model could not show the speed of electrons, or the right amount of empty space
Neils Bohr

His model was accurate, because the atoms has a nucleus, and shows the charges of sub-atomic particles, it shows that most of the mass of an atom in the nucleus, and it shows the electrons orbit the nucleus.
It was in-accurate, because it can't show the speed of electrons, and the correct amount of empty space

Summary of the Atom
How the Model of an atoms has changed
The model of the atom has dramatically changed over many many years.We learned atoms make up different substances and are the smallest particles of matter, which have subatomic particles that are very small portions of matter. At first scientist only thought there were electrons which are negatively charged. Then protons were discovered which are positively charged, and then the nucleus was discovered, and how all of the of these things interact together in an atom.
Today's "accepted"atomic theory
Shows the atom has a nucleus, that electrons orbit it, the charges of subtomic particles, that most of the mass of an atom is in the nucleus
What it cannot show is the amount of empty space in the atom, and the speed of electrons.
WHY we used model of atoms
We use model of atoms to help people visulize what we are talking about when explaining an atom and the inner workings of one..
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