Atomic Theory & Structure

Front

Who first developed the four rules for atomic theory?

Back

John Dalton

Front

What is the charge of an electron?

Back

Negative

Front

What did Rutherford discover?

Back

The nucleus

Front

What are the two main parts of an atom?

Back

Nucleus and electron cloud

Front

What particles are found in the nucleus of an atom?

Back

Protons and neutrons

Front

What is the relative mass of a proton compared to an electron?

Back

Proton is approximately 1836 times more massive than an electron.

Front

What is the role of neutrons in an atom?

Back

Neutrons contribute to the mass of the atom and stabilize the nucleus.

Front

What is the electron cloud?

Back

The region around the nucleus where electrons are likely to be found.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is the significance of the atomic mass?

Back

It is the weighted average mass of an element's isotopes.