In 3d , 4d and 5d series which element is expected to have highest `IE_(1)` ?

Explanation

To determine which element in the 3d, 4d, and 5d series has the highest first ionization energy (IE₁), we can follow these steps:

### Step 1: Understand Ionization Energy
Ionization energy is the energy required to remove the outermost electron from an atom. Generally, the higher the nuclear charge (the total charge of the nucleus), the higher the ionization energy, as the outermost electrons are held more tightly.

**Hint:** Remember that ionization energy increases with increasing nuclear charge and decreases with increasing atomic size.

### Step 2: Identify the Elements in Each Series
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