What are isotopes and how many are there

The video tutorial explains isotopes, which are variants of chemical elements with different neutron numbers. It uses carbon as an example, detailing carbon-12, carbon-13, and carbon-14 isotopes. Carbon-14's instability makes it useful for radiocarbon dating, a method developed by Willard Libby. The video also covers the history of isotopes, mentioning Frederick Soddy, and discusses the applications of isotopes in medicine and other fields. The concept of half-life is introduced, explaining how it helps determine the age of materials.

What is an isotope?

• An element with a different number of neutrons

• An element with a different number of electrons

• An element with a different number of protons

• An element with a different atomic number

How many protons does carbon-13 have?

• 7

• 5

• 8

• 6

What makes carbon-14 different from carbon-12?

• It has more protons

• It has more neutrons

• It has a different atomic number

• It has fewer electrons

Who suggested the existence of isotopes?

• Marie Curie

• Albert Einstein

• Frederick Soddy

• Niels Bohr

Which element is commonly used in radiocarbon dating?

• Nitrogen-14

• Carbon-12

• Carbon-13

• Carbon-14

What is the half-life of carbon-14?

• 5730 years

• 1000 years

• 10,000 years

• 500 years

What is a practical application of radioactive isotopes in medicine?

• Assessing organ function

• Calculating speed

• Determining color

• Measuring temperature