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12 Questions

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Electron Discovery and Charge

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Questions and Answers

What is the main idea of John Dalton's Atomic Theory?

Atoms can be broken down into smaller particles

Electrons are positively charged

Atoms can be created or destroyed

Matter is made of very small particles called atoms (correct)

What is the charge to mass ratio of an electron measured by?

e/m: the mass to charge ratio of a proton

m/e: the mass to charge ratio of a proton

m/e: the mass to charge ratio of an atom

e/m: the charge to mass ratio of an electron (correct)

What is the Plum Pudding Model proposing?

Atoms are negatively charged spheres with positive electrons embedded

Atoms are neutrally charged spheres with no electrons embedded

Atoms are positively charged spheres with positive electrons embedded

Atoms are positively charged spheres with negative electrons embedded (correct)

What did Crooke observe when passing an electric current through a vacuum tube?

Radiation was coming from the negative electrode (cathode) Signup and view all the answers

What is the property of cathode rays when they hit glass?

They fluoresce (glow) Signup and view all the answers

Who suggested the name 'electrons'?

George Stoney Signup and view all the answers

What did J.J. Thomson discover when he passed cathode rays through a small hole in the anode?

That cathode rays were made of negative particles Signup and view all the answers

What did Rutherford's gold foil experiment reveal about the structure of atoms?

That atoms are mostly composed of empty space Signup and view all the answers

What type of particles did Chadwick discover when he bombarded beryllium with alpha particles?

Neutrons Signup and view all the answers

What is the significance of the charge-to-mass ratio of an electron?

It is the ratio of an electron's charge to its mass Signup and view all the answers

According to John Dalton's Atomic Theory, what is true about atoms?

Atoms are indivisible and cannot be created or destroyed Signup and view all the answers

What is the Plum Pudding Model of the atom?

A model where atoms are positively charged spheres with negative electrons embedded Signup and view all the answers