Questions: Which element is the most electronegative? (A) Na (B) K (C) Rb (D) Cs Using the simplified rules taught in CHE 110A, which of these bonds is polar? (A) C-C (B) H-H (C) C-H (D) F-F (E) none of them are polar

Which element is the most electronegative?
(A) Na
(B) K
(C) Rb
(D) Cs

Using the simplified rules taught in CHE 110A, which of these bonds is polar?
(A) C-C
(B) H-H
(C) C-H
(D) F-F
(E) none of them are polar

Transcript text: Which element is the most electronegative? (A) Na (B) K (C) Rb (D) Cs Using the simplified rules taught in CHE 110A, which of these bonds is polar? (A) C-C (B) H-H (C) C-H (D) F-F (E) none of them are polar

Solution

Solution Steps

Step 1: Determine the Most Electronegative Element

Electronegativity is a measure of an atom's ability to attract and hold onto electrons. In the periodic table, electronegativity generally increases across a period from left to right and decreases down a group. Among the given elements (Na, K, Rb, Cs), all of which are alkali metals, sodium (Na) is the highest in the group and thus the most electronegative.

Final Answer for Most Electronegative Element

\(\boxed{\text{(A) Na}}\)

Step 2: Identify the Polar Bond

A polar bond occurs when there is a significant difference in electronegativity between the two atoms involved in the bond. Let's evaluate each option:

(A) C-C: Both carbon atoms have the same electronegativity, so the bond is non-polar.
(B) H-H: Both hydrogen atoms have the same electronegativity, so the bond is non-polar.
(C) C-H: Carbon and hydrogen have different electronegativities, making this bond polar.
(D) F-F: Both fluorine atoms have the same electronegativity, so the bond is non-polar.

Final Answer for Polar Bond

\(\boxed{\text{(C) C-H}}\)

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