C1 - Particles

What is the typical radius of an atom?

1×10 power of -10m

Define concentration

Measure of how much solute is dissolved in a given amount of solvent (units: mol/L)

What is PH a measure of?

H+ concentration

What is the difference between a strong and weak acid?

strong acid = fully ionised

Weak acid = partially ionised

What is an isotope?

Atoms of the same element that have the same number of protons but a different number of neutrons

How did Dalton describe the atom?

Solid spheres that could not be broken down into smaller sub - particles

What did Thompson’s plum pudding model tell us about the atom?

A solid positive sphere with smaller negative charges spread throughout

Describe the three main conclusions from Rutherford’s gold foil experiment

• Atoms are mainly empty space

• Atoms have a positive central nucleus

• Atoms have a dense nucleus

What did Bohr suggest?

Electrons orbit the nucleus in different energy levels or at specific distances from the nucleus

Which two other scientists conducted the gold foil experiment with Rutherford?

Geiger and Marsden