Define ionization energy. How would the ionization energy change when electron in hydrogen atom is replaced by a particle 200 times heavier than electron, but having the same charge?

Explanation

### Step-by-Step Solution:

1. **Definition of Ionization Energy**:
Ionization energy is defined as the minimum energy required to remove an electron from the valence shell of an isolated gaseous atom.

2. **Understanding the Factors Affecting Ionization Energy**:
Ionization energy is influenced by several factors, primarily the effective nuclear charge (Z-effective) and the size of the atom.
- The greater the effective nuclear charge, the higher the ionization energy, as the nucleus holds the electrons more tightly.
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