The video explains why some isotopes are radioactive, focusing on the role of neutrons as nuclear glue. It discusses the stability of isotopes, with examples like hydrogen isotopes, and explains radioactive decay. The video highlights the applications of radioisotopes in medicine and chemistry, such as medical tracers and cancer treatment. It concludes with a summary of key points about isotopes and their significance in science.

What determines the identity and chemical properties of an atom?

• The number of protons

• The number of neutrons

• The number of electrons

• The atomic mass

What is the role of neutrons in the nucleus?

• To determine atomic mass

• To repel protons

• To emit radiation

• To provide nuclear glue

Which isotope of hydrogen is the heaviest?

• Tritium

• Hydrogen-1

• Deuterium

• Hydrogen-2

What is the main reason some isotopes are unstable?

• Too few protons

• Too many protons

• Too many or too few neutrons

• Too many electrons

What is the process called when an unstable nucleus rearranges itself?

• Nuclear fusion

• Nuclear fission

• Radioactive decay

• Chemical reaction

What is the stable state of a nucleus compared to?

• A calm ocean

• A stable weather pattern

• A balanced chemical equation

• A person carrying boxes

How are radioisotopes used in medicine?

• To enhance the taste of food

• To trace body chemistry or blood flow

• To improve vision

• To increase muscle strength

What is a common use of radioisotopes in chemistry?

• To act as markers in reaction sequences

• To decrease reaction temperature

• To increase reaction speed

• To change the color of substances

Which of the following is NOT a use of radioisotopes?

• Medical imaging

• Increasing atomic mass

• Tracing chemical reactions

• Radiotherapy

What is the key point about isotopes of the same element?

• They have different atomic masses

• They have different atomic numbers

• They have the same chemical properties

• They have different chemical properties