Atoms and Radioactivity

Who is this?

• Ernest Rutherford

• J.J. Thomson

• Niels Bohr

• John Dalton

Negatively charged particles located in the electron cloud of an atom

• protons

• quarks

• electrons

• neutrons

Positively charged particles located in the nucleus of an atom

• protons

• quarks

• electrrons

• neutrons

The centre of an atom.

• energy level

• ring

• nucleus

• electron cloud

What did Becquerel accidentally discover?

• Radiation

• Stars

• Uranium

• Atoms

Marie Curie was investigating a uranium-rich mineral (pitchblende) and isolated a sample that was 400 as active as uranium, a new element, that she called...

• radium

• polonium

• francium

• rutherfordium