The table lists experimental electron affinity values (in kJ·mol⁻¹) for the elements…
CHEMISTRY · Multi-part · CBSE · Chemistry · Classification of Elements and Periodicity in Properties · Classification of Elements and Periodicity in Properties
Problem
The table lists experimental electron affinity values (in kJ·mol⁻¹) for the elements of Period 2. One value is intentionally omitted.
Atomic number
Element
Electron affinity (kJ·mol⁻¹)
3
Li
60
4
Be
0
5
B
27
6
C
122
7
N
—
8
O
141
9
F
328
10
Ne
≈0
Use these data to analyze the periodic trend.
(a) Sketch a qualitative graph (no numerical scale required) of electron affinity versus atomic number for Period 2, including an estimated point for nitrogen.
(b) Using the overall trend shape and electron-configuration reasoning, determine a plausible numerical range for the missing nitrogen value. Justify your estimate.
(c) Predict how the general shape and magnitudes of the plotted curve would differ if the same graph were constructed for the elements of Period 3 (Na through Ar). Provide two specific similarities and two specific differences, with explanations.