What Is A Weighted Average?

The video tutorial explains atomic mass, focusing on the concept of weighted mean masses. It discusses the composition of atomic nuclei, highlighting the role of protons and neutrons. The tutorial uses carbon as an example to explain isotopes, particularly carbon-12, carbon-13, and carbon-14, and their applications in dating archaeological finds. It further explores the concept of relative atomic mass, emphasizing the influence of isotope abundance. The tutorial concludes with a discussion on uranium isotopes, particularly uranium-238, and their significance in nuclear fuel.

What is the atomic number of carbon, and how many protons does it have?

• Atomic number 12, with 6 protons

• Atomic number 6, with 6 protons

• Atomic number 12, with 12 protons

• Atomic number 6, with 12 protons

Which carbon isotope is used for dating archaeological objects?

• Carbon-15

• Carbon-13

• Carbon-14

• Carbon-12

How many neutrons are present in a carbon-13 isotope?

• 9 neutrons

• 6 neutrons

• 7 neutrons

• 8 neutrons

What is the relative atomic mass of uranium when calculated based on its isotopic abundance?

• 238.99

• 237.99

• 236.99

• 235.99

Which uranium isotope has the greatest abundance?

• Uranium-238

• Uranium-237

• Uranium-236

• Uranium-235