Electric Charge and Atomic Structure Quiz

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Questions and Answers

What did E. Goldstein discover in 1886?

The indivisibility of the atom
The identification of electrons
The existence of sub-atomic particles
The presence of canal rays in a gas discharge (correct)

What is the charge of a proton represented as?

Minus one (-1)
Plus one (+1) (correct)
It varies
Zero (0)

What is the mass of an electron considered to be?

Unknown
Equal to that of a proton
Negligible (correct)
Heavier than a proton

Where were the protons believed to be located within the atom?

In the interior of the atom (A) Signup and view all the answers

What did Rutherford conclude from the α-particle scattering experiment?

A very small fraction of α-particles were deflected by 1800, indicating that all the positive charge and mass of the gold atom were concentrated in a very small volume within the atom. (D) Signup and view all the answers

What did Rutherford calculate about the radius of the nucleus based on his experiment?

The radius of the nucleus is about 105 times less than the radius of the atom. (B) Signup and view all the answers

What is a drawback of Rutherford’s model of the atom?

Any particle in a circular orbit would undergo acceleration, causing it to lose energy and fall into the nucleus. (A) Signup and view all the answers

What feature did Rutherford's nuclear model propose?

There is a positively charged centre in an atom called the nucleus. Nearly all the mass of an atom resides in the nucleus. (D) Signup and view all the answers