Zinc Isotopes and Atomic Structure

This video tutorial explores the atomic structure of zinc, focusing on its isotopes, atomic number, and mass number. It explains that zinc has five stable isotopes, differing in neutron count, which affects their mass numbers. The atomic number of zinc is 30, indicating 30 protons and, in a neutral state, 30 electrons. The video details how to calculate the number of neutrons using the mass number and discusses the concept of isotope abundance, leading to the average atomic mass of zinc being 65.38.

What is the primary difference between the isotopes of zinc?

• Atomic number

• Number of neutrons

• Number of electrons

• Number of protons

What is the atomic number of zinc?

• 28

• 34

• 30

• 32

How many protons does each zinc isotope have?

• 28

• 30

• 29

• 31

Why are elements on the periodic table considered neutral?

• They have no charge.

• They have equal numbers of neutrons and electrons.

• They have equal numbers of protons and electrons.

• They have equal numbers of protons and neutrons.

How many electrons does a neutral zinc atom have?

• 29

• 28

• 30

• 31

If a zinc isotope has a mass number of 66, how many neutrons does it have?

• 34

• 36

• 38

• 40

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 percentage of a zinc sample is typically zinc-64?

• 49%

• 64%

• 66%

• 51%

What is the average atomic mass of zinc?

• 63.38

• 64.38

• 65.38

• 66.38

How is the average atomic mass of an element determined?

• By using the isotope with the highest mass number.

• By calculating a weighted average based on isotopic abundance.

• By taking a simple average of all isotopes.

• By considering the most abundant isotope only.