The video explains how large nuclei become unstable, similar to a large sand castle losing sand. It introduces alpha particles, which are two protons and two neutrons, and discusses their properties, such as being heavy and having a charge of +2. The video explains how larger nuclei are built using blocks of protons and neutrons, and how alpha particles are emitted from unstable nuclei. It also covers the detection of alpha particles through their interaction with electric fields and atoms, leading to ionization. Finally, it describes how alpha particles transform into helium nuclei after gaining electrons.

What happens to a very large nucleus that makes it unstable?

• It gains extra protons.

• It loses electrons.

• It emits an alpha particle.

• It becomes a sand castle.

Which of the following atoms has a mass number that is a multiple of four?

• Hydrogen

• Helium

• Lithium

• Beryllium

How many protons and neutrons make up an alpha particle?

• Four protons and four neutrons

• Two protons and two neutrons

• One proton and one neutron

• Three protons and three neutrons

What is the charge of an alpha particle?

• 0

• +2

• +1

• -1

Why do alpha particles travel slower than other particles?

• They are lighter.

• They have no charge.

• They are smaller.

• They are heavier.

What happens to an alpha particle when it passes through an electric field?

• It speeds up.

• It bends.

• It splits.

• It stops.

What is a significant property of alpha particles that makes them highly ionizing?

• Their speed

• Their size and charge

• Their color

• Their temperature

What can stop an alpha particle?

• Tissue paper

• A glass of water

• A piece of wood

• A sheet of metal

What does an alpha particle become after it gains two electrons?

• A hydrogen atom

• A helium nucleus

• A carbon atom

• An oxygen molecule

What is the term for the nucleus left behind after alpha emission?

• Parent nucleus

• Cousin nucleus

• Daughter nucleus

• Sibling nucleus