Match the element with its number of valence electrons. Match Term Definition: Helium Aluminum Fluorine Sodium A) 1 B) 2 C) 3 D) 7

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isaiahb30 isaiahb30 · Answer 1 · 2018-10-03T16:42:43+02:00

Helium- 2

Aluminum- 3

Fluorine- 7

Sodium- 1

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RomeliaThurston RomeliaThurston · Answer 2 · 2019-09-30T14:42:02+02:00

Explanation:

Valence electrons are defined as the electrons that are present in the outermost shell of an atom.

Helium is the 2nd element of the periodic table having electronic configuration of [tex]1s^2[/tex]

This element has 2 electrons in its outermost shell. So, it has 2 valence electrons. The correct answer is Option B.

Aluminium is the 13th element of the periodic table having electronic configuration of [tex]1s^22s^22p^63s^23p^1[/tex]

This element has 3 electrons in its outermost shell. So, it has 3 valence electrons. The correct answer is Option C.

Fluorine is the 9th element of the periodic table having electronic configuration of [tex]1s^22s^22p^5[/tex]

This element has 7 electrons in its outermost shell. So, it has 7 valence electrons. The correct answer is Option D.

Sodium is the 11th element of the periodic table having electronic configuration of [tex]1s^22s^22p^63s^1[/tex]

This element has 1 electron in its outermost shell. So, it has 1 valence electron. The correct answer is Option A.