The electronic configuration of elements A, B, C and D are (2, 8, 1), (2, 8, 2), (2, 8, 6) and (2, 8, 7) respectively. Which of them can make an ion with two negative charges?

Options

A. A
B. B
C. C
D. D

Explanation

To determine which of the elements A, B, C, and D can form an ion with two negative charges based on their electronic configurations, we will analyze each element step by step.

### Step 1: Analyze Element A
- **Electronic Configuration**: (2, 8, 1)
- **Valence Electrons**: 1 (the last shell has 1 electron)
- **Ion Formation**:
- Element A can lose 1 electron to achieve the stable electronic configuration of the nearest noble gas (which is Neon, with the configuration 2, 8).
- **Ion Formed**: A can form A⁺ (a positive ion).

### Step 2: Analyze Element B
- **Electronic Configuration**: (2, 8, 2)
- **Valence Electrons**: 2 (the last shell has 2 electrons)
- **Ion Formation**:
- Element B can lose 2 electrons to achieve the stable electronic configuration of Neon (2, 8).
- **Ion Formed**: B can form B²⁺ (a positive ion).

### Step 3: Analyze Element C
- **Electronic Configuration**: (2, 8, 6)
- **Valence Electrons**: 6 (the last shell has 6 electrons)
- **Ion Formation**:
- Element C can either lose 6 electrons or gain 2 electrons. It is easier for it to gain 2 electrons to achieve the stable configuration of Neon (2, 8).
- **Ion Formed**: C can form C²⁻ (a negative ion with two negative charges).

### Step 4: Analyze Element D
- **Electronic Configuration**: (2, 8, 7)
- **Valence Electrons**: 7 (the last shell has 7 electrons)
- **Ion Formation**:
- Element D can gain 1 electron to achieve the stable configuration of Neon (2, 8).
- **Ion Formed**: D can form D⁻ (a negative ion with one negative charge).

### Conclusion
Based on the analysis:
- **Element A** forms A⁺ (no negative charge).
- **Element B** forms B²⁺ (no negative charge).
- **Element C** forms C²⁻ (two negative charges).
- **Element D** forms D⁻ (one negative charge).

**Therefore, the element that can make an ion with two negative charges is Element C.**

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