If Aufbau rule is not followed, what are the blocks of the following elements?
K(19)

Explanation

To determine the block of the element potassium (K) with atomic number 19 when the Aufbau principle is not followed, we will follow these steps:

### Step-by-Step Solution:

1. **Understanding the Aufbau Principle**: The Aufbau principle states that electrons fill atomic orbitals in order of increasing energy levels, starting from the lowest energy orbital. The order of filling is generally: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, and so on.

2. **Electron Configuration of Potassium (K)**: The atomic number of potassium is 19, which means it has 19 electrons. The electron configuration following the Aufbau principle would be:
- 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹.
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