C1.5History Of The Atom
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Who were the first people to come up with the idea that everything could be broken down into something(atom)?
Ancient greeks
What did john Dalton discover?
He discovered atoms were in spheres.
When did John Palton discover this?
1800
Who discovered in 1800 atoms were in spheres?
John dalton
What did JJ Thomson come up with
The plum pudding model
When did JJ Thompson create the Plum pudding model?
1897
Who created the plum pudding model?
JJ Thompson
When did Ernest Rutherford do his experiment
1909
What did Rutherford discover?
• Mass concentrated in the centre • Most of the mass in the nucleus • Most of the atom is empty space • The nucleus is charged • Plum pudding model disproven
Who proved the plum pudding model wrong?
Rutherford
What was the plum pudding?
A model that said negatively and positively charged atoms are everywhere in random places like fruit in a plum pudding.
Niels bohr date of discovery?
1913/1914 kerboodle and google say different things.
What did Bohr discover?
Electrons are in shells at set distances orbiting the nucleus.
Who discovered Electrons are in shells orbiting the nucleus?
Niels Bohr
When was James Chadwick’s discovery?
1932
What did James Chadwick discover?
Discovered neutrons
Who Discovered neutrons?
James Chadwick
What did Dalton suggest?
He suggested substances were made up of atoms like tiny hard spheres. 2: He also suggested that each chemical element had its own atoms that differed from others in their mass. 3: He also believed they could not be divided or split.
Who discovered the electron?
J.J Thomson
When was the electron discovered?
1897
What was discovered about the electron?
It has 1/2000 the mass of the lightest atom CHECK I AM NOT SURE.
How was the electron discovered?
Thomson’s experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons
Describe the experiment J.J Thomson did that discovered the electron.
Gas at very low pressure in a cylinder, a thin slit at the end glass glows through slit by rays coming from negative electrode(the streams of negative electrons.
What is the name pf the experiment that discovered the electron?
Cathode ray tube