P4. Radioactivity

What was discovered that led JJ Thomson to come up with his model for the atom?

• the proton

• the neutron

• the nucleus

• the electron

Which of these is false:

• Protons have a relative mass of 1

• Electrons have a relative mass of 0

• Neutrons have the same mass as protons

• Electrons have a relative mass close to 0

What is an isotope?

• An atom with the same atomic mass but a different atomic number

• Atoms of the same element with different numbers of electrons

• Atoms of the same element with different atomic masses

• Atoms with no electrons

Ernst Rutherford's alpha particle scattering experiment (sometimes called Gold Leaf experiment) discovered what:

• Protons

• The nucleus

• Neutrons

• Electrons

What was the evidence Rutherford's experiment provided to suggest the nucleus was SMALL

• Most of the radiation went straight through the foil

• Some of the radiation was deflected at an angle.

• A very small amount of radiation was deflected back to the source

How many PROTONS does the atom in the image have?

How many NEUTRONS does the atom in the image have?

Which type of radioactive decay has no mass, and travels at (or close to) the speed of light.

• Alpha

• Beta

• Gamma

Which type of radioactive decay has the same structure as a helium nuclei

• Alpha

• Beta

• Gamma

Carbon-14 becomes more stable with the release of a beta particle, and a different nuclei remains. What is the new nuclei?

• Boron

• Carbon

• Nitrogen

• Oxygen