Tellurium's Valence-Shell Configuration: Group 6A, Period 5

Tellurium (Te) is a Group 6A element located in Period 5 of the periodic table. Its atomic number is 52. To determine its valence-shell configuration, we need to consider its position in the periodic table and the number of electrons it has. Here's how to approach it:

1. Period 5: This tells us that tellurium's outermost electrons reside in the 5th energy level (n=5).
2. Group 6A: This indicates that tellurium has 6 valence electrons. These electrons occupy the s and p orbitals within the 5th energy level.

Therefore, the correct valence-shell configuration for tellurium is:

B. 5s'2' 5p'6'

This means that tellurium has 2 electrons in the 5s orbital and 4 electrons in the 5p orbital, giving a total of 6 valence electrons.