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Sources of Electric Charge in Atoms

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Questions and Answers

What is the correct explanation for the greenish light in a gas discharge tube?

It is caused by the movement of atoms in the gas.

It is produced when protons strike the glass walls of the discharge tube.

It is produced when invisible cathode rays strike the glass walls of the discharge tube. (correct)

It is due to the high electrical voltage applied to the gas in the tube.

How did Thomson explain the formation of cathode rays in the gas discharge tube?

By explaining the movement of neutrons within the gas atoms.

By discussing how positive charges are converted into cathode rays.

By stating that atoms in the gas contain protons which form cathode rays.

By describing how electrons are pushed out of gas atoms by high electrical voltage. (correct)

What is the location of electrons within an atom?

Outside the nucleus. (correct)

Within the atomic orbitals.

Within the protons and neutrons.

Inside the nucleus.

How many electrons are present in a hydrogen atom?

One Signup and view all the answers

What is the mass of an electron relative to a hydrogen atom?

$1840$ Signup and view all the answers

How would you define an electron?

'A negatively charged particle found in all elements.' Signup and view all the answers

What was demonstrated by J.J. Thomson in 1997?

The existence of electrons in an atom Signup and view all the answers

How did J.J. Thomson show the presence of electrons in an atom?

By passing electricity at high voltage through a gas at very low pressure Signup and view all the answers

Why are the streams of particles given out by the cathode called cathode rays?

Because they come out of the cathode Signup and view all the answers

What do cathode rays consist of?

Negatively charged particles called electrons Signup and view all the answers

How did J.J. Thomson determine that all atoms contain negatively charged particles?

By analyzing the properties of different gases in his experiments Signup and view all the answers

What did Thomson's experiments reveal about the relationship between electricity and atoms?

Some charged particles are present in the atoms of matter Signup and view all the answers