Question

Ionization energy generally:

• A. Increases from left to right in a period
• B. Decreases from left to right in a period
• C. Remains constant in a period
• D. Increases from top to bottom in a group

Hint:

Ionization energy increases across a period due to the increase in nuclear charge and the decrease in atomic size.

Answer 1

The Correct Option is A

Step 1: Definition of Ionization Energy.
Ionization energy is the energy required to remove an electron from an atom or ion in the gas phase. It is influenced by atomic size and effective nuclear charge. Step 2: Trend Across a Period.
As you move across a period from left to right, the number of protons increases, leading to a higher effective nuclear charge. This stronger attraction makes it more difficult to remove electrons, and thus, the ionization energy increases. Step 3: Conclusion.
Therefore, ionization energy generally increases from left to right in a period.