Lead Isotopes and Atomic Structure

This video tutorial explains the atomic structure of lead, focusing on its isotopes. It covers the atomic number, which is 82 for lead, and how it relates to the number of protons and electrons, ensuring neutrality. The video also discusses the calculation of neutrons using the mass number and the composition of lead's isotopes, including lead-204, lead-206, lead-207, and lead-208. Finally, it explains how to calculate the average atomic mass based on the isotopic abundance of these isotopes.

What is the atomic number of lead (Pb)?

• 80

• 81

• 82

• 83

How many protons does lead have?

• 83

• 81

• 80

• 82

Why are elements on the periodic table considered neutral?

• The number of protons equals the number of electrons.

• They have more protons than electrons.

• They have no protons or electrons.

• They have more electrons than protons.

What distinguishes isotopes of the same element?

• Number of electrons

• Atomic number

• Number of protons

• Number of neutrons

If a lead isotope has a mass number of 204, how many neutrons does it have?

• 126

• 124

• 122

• 120

How do you calculate the number of neutrons in an isotope?

• Subtract the atomic number from the mass number

• Add the atomic number to the mass number

• Multiply the atomic number by the mass number

• Divide the mass number by the atomic number

What is the mass number of lead-206?

• 204

• 206

• 207

• 208

Which lead isotope is the most abundant?

• Lead-208

• Lead-204

• Lead-206

• Lead-207

What is the average atomic mass based on?

• The mass numbers and their abundance

• The number of protons

• The number of electrons

• The atomic number

How is the average atomic mass of an element calculated?

• By considering the mass numbers and their percent abundance

• By averaging the atomic numbers of all isotopes

• By adding the mass numbers of all isotopes

• By multiplying the mass numbers by the atomic number