Which element in the diagram above will gain only 1 electron in its valence shell to complete its octet?
A.
Silicon
B.
Phosphorous
C.
Sulfur
D.
Chlorine
D. Chlorine
The element in the diagram above that will gain only 1 electron in its valence shell to complete its octet is option D. Chlorine.
To determine which element will gain only 1 electron in its valence shell to complete its octet, we need to look at the periodic table.
Silicon (Si) is in Group 14, which means it has 4 valence electrons. To complete its octet, it needs to gain 4 electrons, not just 1.
Phosphorus (P) is in Group 15 and has 5 valence electrons. To complete its octet, it needs to gain 3 electrons, not just 1.
Sulfur (S) is in Group 16 and has 6 valence electrons. To complete its octet, it needs to gain 2 electrons, not just 1.
Chlorine (Cl) is in Group 17 and has 7 valence electrons. To complete its octet, it needs to gain 1 electron, which matches the condition of gaining only 1 electron in its valence shell to complete its octet.
Therefore, the element that will gain only 1 electron in its valence shell to complete its octet is D. Chlorine.