General Science - Physics (Basics)
Which of the following elements has the lowest first ionization energy?
Which of the following elements has the lowest first ionization energy?
medium Q8 of 15
Step-by-Step Solution
Step 1: Understand ionization energy trend
Ionization energy decreases down a group and increases across a period.Step 2: Compare given elements
Cesium is below Rubidium, Potassium, and Lithium in Group 1, so it has the lowest ionization energy among them.Final Answer:
Cesium → Option CQuick Check:
Lowest ionization energy = Cesium ✅
Quick Trick: Ionization energy decreases down Group 1; Cesium is lowest here.
Common Mistakes:
- Confusing Potassium or Rubidium as having lower ionization energy than Cesium.
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