Identify the Isoelectronic Elements

question 108

Multiple Choice

Identify the isoelectronic elements.

• A) Cl^-, F^-, Br^-, I^-, At^-
• B) N^3-, S^2-, Br^-, Cs⁺, Sr²⁺
• C) P^3-, S^2-, C1^-, K⁺, Ca²⁺
• D) Zn²⁺, Co²⁺, Cu²⁺, Cr²⁺, Cd²⁺
• E) Ne, Ar, Kr, Xe, He

---

Definitions:

Hydrostatic Skeleton

A structure in many soft-bodied animals that provides support and movement through the pressure of fluid within the body cavity.

Earthworms

Terrestrial invertebrates that belong to the class Oligochaeta, which are known for their role in soil aeration and composting through their digestive process.

Polychaete

A class of annelid worms characterized by segmented bodies and numerous bristles, commonly found in marine environments.

Coelom

A fluid-filled cavity between the gut and body wall that is lined by tissue derived from mesoderm; the main body cavity of most animals.