Question

question 35 (1 point)
of the following elements, which one has the smallest first ionization energy?
o a aluminum
b boron
o c carbon
d silicon

Explanation:

First ionization energy generally decreases down a group and increases across a period. Aluminum (Al) and silicon (Si) are in period 3, boron (B) and carbon (C) are in period 2. Among these, aluminum has the largest atomic radius (as it is in a lower period compared to B and C, and has a lower effective nuclear charge compared to Si in the same period), so it requires the least energy to remove the first electron.

Answer:

a. aluminum