Which of the Following Statements Regarding Valence Electrons Is Incorrect

question 79

Multiple Choice

Which of the following statements regarding valence electrons is incorrect?

• A)The valence electrons are the electrons in the last-filled principal energy level.
• B)For main-group elements, the number of valence electrons is equal to the number of electrons in the highest-energy s and p sublevels.
• C)Except for helium, the Roman numeral group number corresponds to the number of valence electrons for the main-group elements.
• D)The period number of an element equals the energy level of the valence electrons.
• E)Elements in the p-block in the fourth period and below include their d electrons as part of their valence electron count.