Discussion
Four elements and their electronegativity values (Pauling Scale) are given below. Match the element with its electronegativity value.
| Atom | Electronegativity value |
|---|---|
| Rb | (a) 1.0 |
| Na | (b) 0.8 |
| I | (c) 3.0 |
| Cl | (d) 2.5 |
| (e) 0.9 |
Answer: A
The correct matching is (i)-(b), (ii)-(e), (iii)-(d), (iv)-(c), taking the atoms in the order listed: Rb, Na, I, Cl.
On the Pauling scale (textbook values), rubidium is 0.8 (b) and sodium 0.9 (e): electronegativity falls down group 1. Iodine is 2.5 (d) and chlorine 3.0 (c): it falls down group 17 as well.
Value (a), 1.0, belongs to lithium and is the extra distractor. The other options give Rb or Na a halogen's value, or swap iodine and chlorine, which would make iodine the more electronegative halogen.
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