Question

Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), and Francium (Fr) have similar properties. Which other element is MOST LIKELY to have similar properties?
Responses
A Calcium (Ca)Calcium (Ca)
B Carbon (C)Carbon (C)
C Cesium (Cs)Cesium (Cs)
D Helium (He)

Answer 1

C — Cesium (Cs).

Reason: Li, Na, K, Rb, and Fr are all Group 1 (alkali metals) with a single valence electron, so Cs (also Group 1) will have similar chemical properties. Calcium is Group 2, carbon is a nonmetal, and helium is a noble gas.