Answer
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Work Step by Step
Group 6A elements (also known as Group 16 in modern IUPAC numbering) include the chalcogens: oxygen, sulfur, selenium, tellurium, and polonium. You're asking specifically about the elements in periods 4, 5, and 6, which are:
Period 4: Selenium (Se)
Period 5: Tellurium (Te)
Period 6: Polonium (Po)
Valence Shell Electron Configurations:
1) Selenium (Se) — Period 4
Valence shell: n = 4
Valence configuration: 4s² 4p⁴
Valence electrons: 6
2) Tellurium (Te) — Period 5
Valence shell: n = 5
Valence configuration: 5s² 5p⁴
Valence electrons: 6
3) Polonium (Po) — Period 6
Valence shell: n = 6
Valence configuration: 6s² 6p⁴
Valence electrons: 6
