Why does the density of transition elements increase from Titanium to Copper? (At. No. Ti = 22, Cu = 29)

Explanation

To understand why the density of transition elements increases from Titanium (Ti) to Copper (Cu), we can analyze the relationship between atomic mass, atomic size, and density.

### Step-by-Step Solution:

1. **Identify the Elements**:
- Titanium (Ti) has an atomic number of 22.
- Copper (Cu) has an atomic number of 29.
- Both elements are part of the transition metals in the 3d series.
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