A neutral chlorine atom in its ground state has 17 electrons. Using the modern long-form arrangement which period is chlorine in?
Q1. A neutral chlorine atom in its ground state has 17 electrons. Using the modern long-form arrangement which period is chlorine in?
Answer: Period 3
Explanation: Chlorine has 17 electrons arranged in three electron shells (2, 8, 7), placing it in Period 3 of the periodic table. The period number corresponds to the highest principal quantum number (outermost shell) occupied by electrons in the ground state atom.