Which elements have the most similar chemical properties? (1) K and Na (2) K and Cl (3) K and Ca (4) K and S

Step 1: Define the Problem

Identify which elements have the most similar chemical properties to potassium (K).

Step 2: Break Down the Problem

• Consider the position of each element in the periodic table.
• Determine which elements belong to the same group as potassium.

Step 3: Apply Relevant Concepts

• Elements in the same group (vertical column) of the periodic table have similar chemical properties.
• Potassium (K) is in Group 1, known as the alkali metals.

Step 4: Analysis, Verify and Summarize

• K (Potassium) and Na (Sodium) are both in Group 1.
• Cl (Chlorine) is in Group 17, Ca (Calcium) is in Group 2, and S (Sulfur) is in Group 16.
• Therefore, K and Na have the most similar chemical properties because they are both alkali metals.

Final Answer

(1) K and Na