What is the radius of an atom?

How does the radius of the nucleus compare to the radius of the whole atom?

Describe simply the structure of the atom (the current model)

Compare the proton, neutron and electron

What does the mass number mean?

What does the atomic number mean?

An atom of sodium (Na) has 11 protons and 12 neutrons. What is the symbol for this atom?

How many electrons does the atom have?

What happens if an atom loses one or more outer electrons?

An atom has no overall charge – what does this mean?

Define what isotopes are

Describe how electrons are arranged in the atom

How can an electron move to a shell closer, or further away from the nucleus?

What causes a new scientific model to be change or replaced?

Who suggested the Plum Pudding model of the atom?

Describe the plum pudding model

State the results of the alpha scattering experiment

What were the names of the scientists carrying out the alpha scattering experiment?