Understanding Radioactivity

What is the primary reason some elements are more radioactive than others?

• They have an unstable nucleus.

• They have more electrons.

• They are heavier in mass.

• They have a higher atomic number.

Which type of decay involves the release of a helium nucleus?

• Alpha decay

• Delta decay

• Gamma decay

• Beta decay

What happens during beta decay?

• An atom releases a helium nucleus.

• An atom absorbs a neutron.

• A neutron turns into a proton, emitting an electron.

• An atom emits high-energy photons.

Why are gamma rays considered dangerous?

• They have a positive charge.

• They are heavier than alpha particles.

• They are visible to the human eye.

• They can easily penetrate materials and damage DNA.

What does the half-life of a radioactive element indicate?

• The time it takes for the element to become completely stable.

• The time it takes for half of the element to decay.

• The time it takes for the element to emit all its energy.

• The time it takes for the element to double in mass.