Why is triplet excited state lower in energy than singlet?

Question:

Why is triplet excited state lower in energy than singlet?

Energy of Excited States:

When an electron in a molecule is excited to a higher energy orbital, there are two possible excited states possible. One is a singlet state where the electron's spin is opposite that of its original spin, and the other one is a triplet state where the electron retains the same spin as it started.

Answer and Explanation:

The primary reason for a triplet excited state being lower energy than a singlet excited state is related to Hund's Rule for filling degenerate atomic...

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Excited State in Chemistry: Definition & Overview

from General Studies Science: Help & Review

Chapter 1 / Lesson 5
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