Which of the sequences given below shows the correct increasing order of energy?

Options

A. 3s, 3p, 4s, 4p, 3d, 5s, 5p, 4d
B. 3s, 3p, 3d, 4s, 4p, 4d, 5s, 5p
C. 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p
D. 3s, 3p, 4s, 4p, 5s, 3d, 4d, 5p

Explanation

To determine the correct increasing order of energy for the given orbitals, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Order of Orbital Filling**: The order in which orbitals are filled with electrons is determined by the Aufbau principle. The general order of filling is based on the increasing energy levels of the orbitals.

2. **List the Orbitals**: The orbitals can be listed in order of increasing energy as follows:
- 1s
- 2s
- 2p
- 3s
- 3p
- 4s
- 3d
- 4p
- 5s
- 4d
- 5p
- 6s
- 4f
- 5d
- 6p
- 7s
- 5f
- 6d
- 7p

3. **Analyze the Given Options**: The options provided are:
- Option A: 3s, 3p, 4s, 4p, 3d, 5s
- Option B: (not specified)
- Option C: (not specified)
- Option D: (not specified)

4. **Check Each Option**:
- Start with **3s**: This is the first orbital filled.
- Next is **3p**: This follows after 3s.
- Then comes **4s**: This is filled before 3d.
- After **4s**, we fill **3d**.
- After **3d**, we fill **4p**.
- Finally, we fill **5s**.

5. **Identify the Correct Sequence**: Based on the order of filling:
- The correct increasing order of energy is: **3s, 3p, 4s, 3d, 4p, 5s**.

6. **Select the Correct Option**: From the analysis, we can see that the correct option that matches this order is **Option C**.

### Final Answer:
The correct increasing order of energy is represented by **Option C**.

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