Atomic Models

Front

What are cathode rays?

Back

Cathode rays are streams of electrons observed in vacuum tubes, which carry a negative charge.

Front

What particles are located in the nucleus of an atom?

Back

Protons and neutrons are located in the nucleus of an atom.

Front

How do you calculate the number of neutrons in an isotope?

Back

To find the number of neutrons, subtract the atomic number (number of protons) from the mass number.

Front

What is the mass number of Bromine-80?

Back

The mass number of Bromine-80 is 80.

Front

Who proposed the nuclear model of the atom?

Back

Ernest Rutherford proposed the nuclear model of the atom, which includes a positively charged nucleus.

Front

What is a neutron?

Back

A neutron is a subatomic particle with a mass nearly equal to that of a proton, but it carries no electrical charge.

Front

What is the charge of a proton?

Back

A proton carries a positive electrical charge.

Front

What is the charge of an electron?

Back

An electron carries a negative electrical charge.

Front

What did J.J. Thomson discover?

Back

J.J. Thomson discovered the electron and proposed the plum pudding model of the atom.

Front

What is the significance of the atomic number?

Back

The atomic number represents the number of protons in an atom and determines the element's identity.