What is a valence electron? How many valence electrons does an element in Group 2 have? Group 18?

Answer 1

A valance electron is an electron that is the outer shells and can be used for bonding

Group 2 contains two electrons in valence.

(The 10 d electrons will drop down into the next lower shell and are no longer in the outermost shell and are not available for bonding.) Group 18 would have 8 valance electrons.

18 - 10 = 8

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Answer 2

Xavier Avery

A valence electron is an electron located in the outermost shell (valence shell) of an atom, which is involved in chemical bonding. An element in Group 2 of the periodic table has 2 valence electrons, while an element in Group 18 (also known as the noble gases) has 8 valence electrons, except for helium, which has 2 valence electrons.

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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.