Atoms, Isotopes, Ions, and Molecules: The Building Blocks

Review Questions

If xenon has an atomic number of 54 and a mass number of 108, how many neutrons does it have?

  1. 54
  2. 27
  3. 100
  4. 108

Hint:

A

Atoms that vary in the number of neutrons found in their nuclei are called ________.

  1. ions
  2. neutrons
  3. neutral atoms
  4. isotopes

Hint:

D

Potassium has an atomic number of 19. What is its electron configuration?

  1. shells 1 and 2 are full, and shell 3 has nine electrons
  2. shells 1, 2 and 3 are full and shell 4 has three electrons
  3. shells 1, 2 and 3 are full and shell 4 has one electron
  4. shells 1, 2 and 3 are full and no other electrons are present

Hint:

C

Which type of bond represents a weak chemical bond?

  1. hydrogen bond
  2. atomic bond
  3. covalent bond
  4. nonpolar covalent bond

Hint:

A