Unit 2 PreTest

Front

What is the mass comparison between a proton and an electron?

Back

The mass of one proton is greater than the mass of one electron.

Front

Who proposed the 'Plum Pudding' model of the atom?

Back

J.J. Thomson is best known for his 'Plum Pudding' model of the atom.

Front

What is the symbol for a bromine ion that gains 1 electron?

Back

The correct symbol for a bromine ion that gains 1 electron is Br^-1.

Front

Which subatomic particle has a positive charge?

Back

The proton has a positive charge.

Front

Who developed a planetary model of the atom?

Back

Niels Bohr developed a model of the atom that is depicted similar to a planetary/solar system.

Front

What is the charge of an electron?

Back

The charge of an electron is negative.

Front

What is the charge of a neutron?

Back

A neutron has no charge (it is neutral).

Front

What is the atomic model proposed by Ernest Rutherford?

Back

Ernest Rutherford proposed the nuclear model of the atom, which includes a dense nucleus surrounded by electrons.

Front

What is the significance of J.J. Thomson's cathode ray experiment?

Back

J.J. Thomson's cathode ray experiment led to the discovery of the electron.

Front

What does the atomic number represent?

Back

The atomic number represents the number of protons in the nucleus of an atom.