Atomic Theory

Front

What is the atomic number?

Back

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

Front

How did Thomson build upon Dalton's model?

Back

Thomson discovered subatomic particles, specifically the electron.

Front

What contribution did John Dalton make to atomic theory?

Back

Dalton discovered that every element consisted of one type of atom that couldn't be divided.

Front

Who discovered the nucleus using the gold foil experiment?

Back

Ernest Rutherford discovered the nucleus using the gold foil experiment.

Front

If an atom has 12 positively charged subatomic particles, how many electrons must it have to be neutral?

Back

It must have 12 electrons to be considered a neutral atom.

Front

What are protons?

Back

Protons are positively charged subatomic particles found in the nucleus of an atom.

Front

What are neutrons?

Back

Neutrons are neutral subatomic particles found in the nucleus of an atom.

Front

What are electrons?

Back

Electrons are negatively charged subatomic particles that orbit the nucleus of an atom.

Front

What is Dalton's atomic theory?

Back

Dalton's atomic theory states that all matter is made of atoms, which are indivisible and indestructible.

Front

What is the significance of the gold foil experiment?

Back

The gold foil experiment demonstrated that atoms have a small, dense nucleus.