- #1
amm508
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Hi,
Which of ZnS and CdSe will have the larger band gap energy, explain.
The answer is given as Zinc sulfide will have a larger band gap energy than cadmium selenide. Both
are II-VI compounds, and Zn and S are both higher vertically in the periodic table than Cd and Se. In moving from bottom to top up the periodic table, band gap energy increases.
I don't understand why moving from bottom up in the periodic table increases bang gap energy. Is it because electronegativity increases?
Would really appreciate if anyone could explain this!
Thank you v much in advance.
Which of ZnS and CdSe will have the larger band gap energy, explain.
The answer is given as Zinc sulfide will have a larger band gap energy than cadmium selenide. Both
are II-VI compounds, and Zn and S are both higher vertically in the periodic table than Cd and Se. In moving from bottom to top up the periodic table, band gap energy increases.
I don't understand why moving from bottom up in the periodic table increases bang gap energy. Is it because electronegativity increases?
Would really appreciate if anyone could explain this!
Thank you v much in advance.