Which one of the following processes `alpha, beta^(o+), beta^(o-)`, or K-capture cause
a. An increase in atomic number
b. A decrease in atomic number
c. Emission of X-rays

Explanation

To solve the question regarding the processes of alpha decay, beta plus decay, beta minus decay, and K-capture, we will analyze each process step by step to determine their effects on atomic number and the emission of X-rays.

### Step-by-Step Solution:

1. **Alpha Decay**:
- An alpha particle consists of 2 protons and 2 neutrons (essentially a helium nucleus).
- When an atom undergoes alpha decay, it loses 2 protons and 2 neutrons.
- **Effect on Atomic Number**: Decreases by 2.
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