Unit (1) Electron Configuration and Atomic Structure Quiz

What is the maximum number of electrons that can occupy the second energy level (L)?

• 2
• 8
• 18
• 32

Which of the following correctly describes the electron configuration of an atom with 13 electrons?

• 2, 8, 3
• 2, 11
• 2, 8, 1, 2
• 2, 8, 2, 1

What does the atomic number (Z) represent?

• The total number of neutrons in an atom
• The total number of electrons in an atom
• The number of protons in an atom
• The number of nucleons in an atom

If an element has 20 protons, what is its atomic number?

• 10
• 20
• 30
• 40

Which of the following statements about isotopes is true?

• Isotopes have different numbers of protons.
• Isotopes have the same number of neutrons.
• Isotopes of an element have the same atomic number.
• Isotopes are always unstable.

What is the mass number of an atom with 12 protons and 14 neutrons?

• 12
• 14
• 26
• 28

Which of the following statements best describes valence electrons?

• They are found in the innermost energy level.
• They determine the chemical behavior of an atom.
• They are always equal to the number of protons.
• They do not participate in bonding.

In the electron configuration 2, 8, 8, 1, how many valence electrons does the atom have?

• 1
• 2
• 8
• 18

What happens to an atom when it reaches an excited state?

• It loses all its electrons.
• Electrons move to lower energy levels.
• One or more electrons absorb energy and move to higher energy levels.
• The atom becomes an ion.

Which of the following elements has the electron configuration of 2, 8, 8, 2?

• Magnesium (Mg)
• Calcium (Ca)
• Argon (Ar)
• Silicon (Si)