The outer electronic configuration of the ground state chromium atom is 3d44s2. (JEE 1982)

Question

The outer electronic configuration of the ground state chromium atom is 3d44s2.   	(JEE 1982)

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**Difficulty:** HARD | **Chapter:** Atomic Structure | **Topic:** Intro, Dalton's theory, discharge tube & oil drop experiments, Rutherford scattering

Accepted Answer

## ✅ Correct Answer: **F**

### 📖 Detailed Explanation:
**Solution:**

Chromium (Cr, Z = 24)

**Expected configuration:** [Ar] 3d⁴ 4s²

**Actual configuration:** [Ar] **3d⁵ 4s¹**

This is due to **extra stability** of:
- Half-filled d subshell (d⁵)
- Half-filled s subshell (s¹)

The configuration 3d⁴ 4s² is **INCORRECT**.

**Answer: False (F)**

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The outer electronic configuration of the ground state chromium atom is 3d44s2. (JEE 1982)

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