How do you define a valence electron? How do you determine the valence number of an atom?

Answer 1

A valence electron is an electron that is in the valence shell. The valence shell is the electron shell that is furthest from the nucleus.

The number of electrons an atom can hold varies depending on how many shells it is occupied with; for example, lithium has three electrons total, but only one valence electron because the other two are used up in the first shell. The valence number can be found out by counting the number of electrons the atom possesses.

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Answer 2

Naomi Aronson

A valence electron is an electron in the outermost energy level of an atom. The valence number of an atom is determined by the number of electrons in its outermost energy level.

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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.