This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
ScanSolve AI Answer
The correct option is C. Step 1: Analyze each option to determine the classification of the elements. A. S and Li: Sulfur (S) is a non-metal. Lithium (Li) is a metal. This option contains both a non-metal and a metal. B. He and Be: Helium (He) is a non-metal (specifically, a noble gas). Beryllium (Be) is a metal. This option contains both a non-metal and a metal. C. K, Li and Na: Potassium (K), Lithium (Li), and Sodium (Na) are all alkali metals, which are a type of metal. All elements in this set are metals. D. Ca, Cr and Co: Calcium (Ca) is an alkaline earth metal. Chromium (Cr) and Cobalt (Co) are transition metals. All elements in this set are metals. Step 2: Identify the set that contains only metals. Both options C and D contain only metals. However, in a multiple-choice question, there is typically one intended best answer. Option C consists of three alkali metals, which are a very distinct and well-known group of metals. The final answer is C. That's 2 down. 3 left today — send the next one.