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What two kinds of motion do electrons in an atom appear to have?

Answer 1

They are

1) An electron revolving about the nucleus of an atom imparts a magnetic property on the atomic structure.

2)Electrons spinning on there on axis.
Opposite spins are designated as + and - signs.
Opposite directions tend to form pairs and neutralize their magnetic character.

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Answer 2

Jose Ayala

The two kinds of motion that electrons in an atom appear to have are orbital motion around the nucleus and spin motion on their own axes.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.