Question
Answer the following about periodic table trends, for 10 points each.
[10e] This dimensionless quantity tends to increase from left to right across the table. Fluorine has a value of 3.98 for this quantity on the Pauling scale.
ANSWER: electronegativity [prompt on chi]
[10m] This quantity, which also increases left-to-right, equals the energy released in the formation of a given element’s minus-one anion. Mulliken electronegativity equals the average of this quantity and ionization energy.
ANSWER: electron affinity [accept E-sub-ea]
[10h] This quantity, which tends to decrease down a group, equals approximately half the difference between ionization energy and electron affinity. Ralph Pearson developed a theory where small, highly charged species have high values of this quantity.
ANSWER: chemical hardness [accept Pearson's absolute hardness; prompt on eta]
<Science - Chemistry>
Data
Summary
| Tournament | Edition | Exact Match? | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|---|---|
| 2025 PACE NSC | 06/07/2025 | Y | 38 | 16.05 | 92% | 61% | 8% |