Calculate the number of valence electrons in Thallium using its electron configuration step by step.
Determine the number of valence electrons in Thallium (Tl, Element 81)
The abbreviated (condensed) ground electronic configuration for Thallium is:
[Xe] 4f14 5d10 6s2 6p1
Electrons in atomic orbitals outside the [Xe] core are the outermost electrons:
4f14 5d10 6s2 6p1
Extract the principle quantum number, n, and number of electrons from the electron configuration:
|Electron Configuration||n||Orbital||Number of Electrons|
The outermost electrons with the largest principal quantum number (in this case, n = 6) are valence electrons.
Thallium (Tl) has 3 (2 + 1) valence electrons.