This question is about the structure of an atom of polonium.

What is the atomic number of polonium?

What is the mass number of polonium?

What is the number of neutrons in the polonium nucleus?

What is the number of electrons in an atom of polonium?

What is the overall charge of an atom of polonium?

This question is about the work of Geiger and Marsden.

These two scientists fired alpha particles at a thin sheet of gold. 

Describe the structure of the alpha particles used in this experiment. 

Most of the alpha particles passed through the gold foil with little or no deflection. 

State the conclusion that was made from this observation. 

Some positively charged alpha particles were deflected through large angles. 

Explain what can be concluded from this observation.

Complete the diagram below by showing the paths taken by the incident alpha particles. 

This question is about the structure of the atom. 

A student has drawn a diagram of the atom below.

The student's diagram is wrong. 

Explain why the diagram is wrong.

An ion of magnesium has 12 protons in the nucleus and 10 electrons in orbital shells.

Calculate the relative charge on the ion. 

Magnesium-23 is an isotope.

State the number of protons and neutrons in the nucleus of magnesium-23.

This question is about Thomson's plum pudding model of the atom. 

The diagram below shows the structure of the atom as predicted by the plum pudding model.

Describe the structure of the atom in the plum pudding model.

Scientists sometimes replace one scientific model with another model.

The plum pudding model was replaced in the 20th century with the nuclear model of the atom.

Explain what led to the plum pudding model of the atom being replaced by the nuclear model of the atom.

This question is about isotopes and the structure of the atom. 

The diagram below shows the nucleus of a lithium atom. 

Describe the structure of the nucleus above. 

Draw an isotope of the nucleus of lithium.

State the number of electrons in an isotope of lithium.