Complete Question:
Match the element with its number of valence electrons.
Column A
1. Helium.
2. Aluminum.
3. Fluorine.
4. Sodium.
Column B
A. 7
B. 1
C. 3
D. 2
Answer:
1. D
2. C
3. A
4. B
Step-by-step explanation:
In Chemistry, valence electrons can be defined as the number of electrons present in the outermost shell of an atom. Valence electrons are used to determine whether an atom or group of elements found in a periodic table can bond with others. Thus, this property is typically used to determine the chemical properties of elements.
1. Helium: this element is found in group (2) of the periodic table and as such it has 2 electrons in its outermost shell. Therefore, Helium has two (2) valence electrons.
2. Aluminum: it is an element found in group (3) of the periodic table and as such it has 3 electrons in its outermost shell. Therefore, Aluminum has three (3) valence electrons.
3. Fluorine: it is found in group (7) of the periodic table known as halogens and as such it has 7 electrons in its outermost shell. Therefore, Fluorine has seven (7) valence electrons.
4. Sodium: this element is found in group (1) of the periodic table and as such it has 1 electrons in its outermost shell. Hence, Sodium has two (1) valence electrons.