Exploring Isotopes and Atomic Mass Calculations

The video tutorial covers the concept of isotopes, explaining how to identify them using atomic and mass numbers. It discusses isotopes of hydrogen, their properties, and how they differ in neutron count. The tutorial also explains how to calculate average atomic mass using a weighted average of isotopes and introduces mass spectrometry as a tool for analyzing isotopes. Sample questions are provided to reinforce learning, and the video concludes with a summary of key points.

What does the atomic number of an element represent?

• The mass number

• The number of neutrons

• The number of electrons

• The number of protons

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

• Divide the mass number by the atomic number

• Multiply the atomic number by the mass number

• Subtract the atomic number from the mass number

• Add the atomic number and mass number

What is the name of the isotope with 38 protons and a mass number of 95?

• Plutonium-95

• Strontium-95

• Strontium-38

• Xenon-95

Which isotope of hydrogen has one proton and no neutrons?

• Protium

• Deuterium

• Tritium

• Hydrogen-2

What percentage of hydrogen atoms are deuterium?

• 1%

• 0.011%

• 99.989%

• 0.1%

How do isotopes of the same element differ?

• Chemical properties

• Number of protons

• Number of electrons

• Number of neutrons

How is the average atomic mass of an element calculated?

• By adding the masses of all isotopes

• By subtracting the mass of the lightest isotope from the heaviest

• By taking the weighted average of all isotopes' masses

• By taking the simple average of all isotopes' masses

What is the mass of gallium-71 if gallium-69 has a mass of 68.926 AMU and an abundance of 60.108%?

• 71.926 AMU

• 68.926 AMU

• 70.925 AMU

• 69.723 AMU

What instrument is used to analyze the relative abundance of isotopes in a sample?

• Nuclear magnetic resonance spectrometer

• Mass spectrometer

• X-ray diffractometer

• Electron microscope

Which isotope of zirconium is the most abundant according to the mass spectrometer graph?

• Zirconium-90

• Zirconium-92

• Zirconium-94

• Zirconium-96