Valence Electrons in Technetium (Tc)
Calculate the number of valence electrons in Technetium using its electron configuration step by step.
Valence Electrons in Technetium
Determine the number of valence electrons in Technetium (Tc, Element 43)
Step 1: Look up the electronic configuration for Technetium
The abbreviated (condensed) ground electronic configuration for Technetium is:
[Kr] 4d5 5s2
Calculate Electronic Configuration for Technetium
Step 2: Identify the outermost electrons using the electronic configuration
Electrons in atomic orbitals outside the [Kr] core are the outermost electrons:
4d5 5s2
Step 3: Use the principle quantum number to identify the valence electrons
Extract the principle quantum number, n, and number of electrons from the electron configuration:
| Electron Configuration | n | Orbital | Number of Electrons |
|---|---|---|---|
| 4d5 | 4 | d | 5 |
| 5s2 | 5 | s | 2 |
The outermost electrons with the largest principal quantum number (in this case, n = 5) are valence electrons.
Answer
Technetium (Tc) has 2 valence electron(s).
