Atomic Structure and Isotopes

This video tutorial covers the basics of atoms and isotopes, explaining how to use the periodic table to determine the number of protons, neutrons, and electrons in an atom. It discusses the concept of isotopes, using carbon as an example, and provides practice problems with elements like molybdenum and barium to illustrate how to calculate atomic properties.

What defines the identity of an element?

• Atomic mass

• Number of electrons

• Number of protons

• Number of neutrons

What is an isotope?

• Atoms with the same atomic mass

• Atoms with different numbers of protons

• Atoms with the same number of protons but different masses

• Atoms with different numbers of electrons

What does the atomic number of an element represent?

• The atomic mass

• The number of neutrons

• The number of protons

• The number of electrons

How is the atomic mass of an element determined?

• By adding the number of protons and electrons

• By adding the number of protons and neutrons

• By adding the number of protons, neutrons, and electrons

• By adding the number of neutrons and electrons

Which of the following is an isotope of carbon?

• Carbon-18

• Carbon-15

• Carbon-12

• Carbon-10

What are nuclides?

• Atoms with the same number of protons but different masses

• Atoms with the same atomic mass

• Atoms with the same number of electrons

• Atoms with different numbers of protons

How can you find the number of electrons in a neutral atom?

• By adding the number of protons and neutrons

• By subtracting the number of neutrons from the atomic mass

• By looking at the atomic number

• By looking at the atomic mass

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

• Number of electrons minus number of protons

• Number of protons minus number of electrons

• Atomic mass minus atomic number

• Atomic number minus atomic mass

In the example of niobium, what is the number of neutrons?

• 93

• 137

• 52

• 41

For barium with a 2+ charge, how many electrons are present?

• 56

• 54

• 52

• 58