The elements A, B, C and D have indicated electronic arrangement, which is the most metallic element?

Options

A. A:2, 8, 4
B. B: 2, 8, 8
C. C: 2, 8, 8, 1
D. D: 2, 7

Answer

To determine which of the elements A, B, C, and D is the most metallic based on their electronic arrangements, we can follow these steps:

### Step 1: Identify the Electronic Configurations
The electronic configurations of the elements are given as follows:
- Element A: 2, 8, 4
- Element B: 2, 8, 8
- Element C: 2, 8, 8, 1
- Element D: 2, 7

### Step 2: Understand Metallic Character
Metallic character refers to the ability of an element to lose electrons easily. The more readily an element can lose electrons, the more metallic it is. This tendency is influenced by the stability of the element's electronic configuration.

### Step 3: Analyze Each Element
- **Element A (2, 8, 4)**: This element has 4 electrons in its outer shell. It can either gain 4 electrons or lose 4 electrons to achieve stability, making it less metallic.

- **Element B (2, 8, 8)**: This element has a complete outer shell (8 electrons), indicating it is very stable and does not tend to lose or gain electrons. Therefore, it is not metallic.

- **Element C (2, 8, 8, 1)**: This element has 1 electron in its outer shell. It is easier for this element to lose that 1 electron to achieve stability (8 electrons in the next shell), making it more metallic.

- **Element D (2, 7)**: This element has 7 electrons in its outer shell. It is more likely to gain 1 electron to achieve stability rather than lose electrons, which makes it less metallic.

### Step 4: Conclusion
Based on the analysis, Element C, which has the electronic configuration of 2, 8, 8, 1, is the most metallic element because it can easily lose its single valence electron to achieve a stable electronic configuration.

### Final Answer
**Element C is the most metallic element.**

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