Which of the following is a polyatomic element?

• A. Chlorine
• B. Oxygen
• C. Hydrogen
• D. Iron
• E. Selenium

Answer: (E)

Verified step by step guidance

1. Understand the concept of a polyatomic element: A polyatomic element is one that naturally exists as molecules consisting of multiple atoms of the same element bonded together.
2. Identify the common forms of the elements listed: Chlorine (Cl₂), Oxygen (O₂), and Hydrogen (H₂) are diatomic molecules, meaning they naturally exist as two atoms bonded together. Iron (Fe) is a metallic element that does not form molecules in its natural state.
3. Recognize that Selenium (Se) can form polyatomic molecules, such as Se₈, which is a ring of eight selenium atoms bonded together.
4. Compare the molecular forms: While Chlorine, Oxygen, and Hydrogen are diatomic, Selenium can form larger polyatomic structures.
5. Conclude that Selenium is the polyatomic element among the options provided, as it can naturally exist in a form with more than two atoms bonded together.