Reactivity of transition elements decreases almost regularly from Sc to Cu. Explain.

Explanation

To explain why the reactivity of transition elements decreases almost regularly from Scandium (Sc) to Copper (Cu), we can follow these steps:

### Step 1: Understanding the Transition Elements
The transition elements in question are Scandium (Sc) to Copper (Cu), which are part of the 3d series in the fourth period of the periodic table.

### Step 2: Ionization Energy Trend
As we move from left to right across a period in the periodic table, the ionization energy generally increases. This is because the nuclear charge increases, leading to a stronger attraction between the nucleus and the electrons.

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