Question

1pt which of the following elements has the most ionization energy?

a. c

b. si

c. ca

d. sr

Explanation:

Ionization energy generally increases across a period and decreases down a group in the periodic table. Carbon (C) is in period 2, silicon (Si) is in period 3, calcium (Ca) is in period 4, and strontium (Sr) is in period 5. Since C is in the highest period (smallest atomic radius among these, electrons are closer to the nucleus and harder to remove), it has the highest ionization energy.

Answer:

A. C