Question

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

Answer 1

Helium- 2

Aluminum- 3

Fluorine- 7

Sodium- 1

Hope I helped.

Answer 2

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 $1s^2$

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 $1s^22s^22p^63s^23p^1$

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 $1s^22s^22p^5$

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 $1s^22s^22p^63s^1$

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