Lithium Isotopes and Atomic Structure

This video tutorial explains the atomic structure of lithium, focusing on its protons, neutrons, electrons, and mass number. It covers the concept of isotopes, specifically lithium-6 and lithium-7, and how to calculate the number of neutrons using the mass number. The video also discusses the average atomic mass of lithium and how isotopes are represented in notation. The tutorial concludes with a summary of the key points about lithium's atomic structure.

What is the atomic number of lithium?

• 4

• 1

• 2

• 3

In a neutral lithium atom, how do the number of protons compare to the number of electrons?

• Cannot be determined

• Protons are more

• Electrons are more

• They are equal

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

• Divide mass number by atomic number

• Add atomic number to mass number

• Multiply atomic number by mass number

• Subtract atomic number from mass number

What is the mass number of the most common lithium isotope?

• 6

• 9

• 7

• 8

What percentage of lithium atoms are lithium-7?

• 100%

• 92.4%

• 75%

• 50%

How is the average atomic mass of lithium calculated?

• By adding the masses of all isotopes

• By averaging the masses of all isotopes

• By taking the mass of the most common isotope

• By subtracting the mass of the least common isotope

How is lithium-7 represented in isotope notation?

• Li-6

• Li-7

• Li-8

• Li-9

What is the atomic number of lithium in isotope notation?

• 1

• 2

• 4

• 3

Which number is written at the top in isotope notation?

• Neutron number

• Atomic number

• Mass number

• Electron number

What does the atomic number represent?

• Number of electrons

• Number of neutrons

• Number of protons

• Number of isotopes