Helium Isotopes and Properties

This video tutorial explores the isotopes of helium, focusing on the stable isotopes helium-3 and helium-4. It explains the concept of atomic and mass numbers, highlighting that while protons and electrons remain constant, neutrons differ among isotopes. The video details the composition of helium-3 and helium-4, emphasizing their respective mass numbers and neutron counts. It also discusses the average atomic mass of helium, which is influenced by the abundance of its isotopes, with helium-4 being the most prevalent. The tutorial concludes by noting the existence of other radioactive isotopes of helium that decay rapidly.

What is the main difference between isotopes of the same element?

• Number of protons

• Number of neutrons

• Number of electrons

• Atomic number

How many protons does helium-3 have?

• One

• Two

• Three

• Four

What is the mass number of helium-3?

• 5

• 4

• 3

• 2

How many neutrons are present in helium-3?

• One

• Zero

• Two

• Three

What is the mass number of helium-4?

• 3

• 5

• 4

• 2

How many neutrons does helium-4 contain?

• Two

• Three

• Zero

• One

What is the average atomic mass of helium?

• 4.00

• 3.00

• 4.50

• 3.50

What percentage of helium in a sample is typically helium-4?

• 50%

• 75%

• 100%

• 99.998%

Which isotope of helium is more abundant in nature?

• Helium-3

• Helium-2

• Helium-4

• Helium-5

What is a characteristic of the other isotopes of helium not discussed in detail?

• They have more protons

• They have fewer electrons

• They are stable

• They are radioactive