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2kcio3+I2 = = 2kio3+ci2 ↑ Where are the valences of CI and I calculated respectively?
Because many elements have valence changes, junior high school students only learn the most basic valence.

Or the valence that has just been asked to master in the senior high school entrance examination.

In fact, the valence of elements is a very complicated problem.

When you get to middle school, you just need to master the calculation method of using the valence law.