Atomic structure AQA Alevel Chemistry

Questions to enhance your understanding

Why is the strong nuclear force stronger than electrostatic forces?

It overcomes repulsion between protons in nucleus.

19th century: What did John Dalton say atoms were?

• Solid spheres.

• Different spheres made different elements.

• All atoms of an element have the same mass.

Define Relative Atomic Mass (A_r) of an element (1x)

Average mass of an atom of an element on a scale where an atom of carbon-12 is 12.

Define Relative Isotopic Mass

Mass of an atom of an isotope of an element on a scale where an atom of carbon-12 is 12.