Question

topic: bonding
name:
date:
period

1. how many valence electrons does h have?
2. 2) how many valence electrons does s have?
3. 3) how many total valence electrons do they have together?

complete the lewis structure for the diagrams at the top right corner and below..
criss-cross-drop:

1. the charges will criss-cross
2. the criss-crossed charges will then drop and become the subscripts
3. the compound should now have a balanced neutral charge

criss-cross rule
example: aluminum chloride
criss-cross rule
example: aluminum oxide
use the correct method to combine the elements and write the correct formula:
gallium bromide
ga + br =
calcium sulfide
ca + s =
potassium oxide
k + o =

Explanation:

Step1: Determine the charges of ions

• Gallium (Ga) has a charge of \(Ga^{3+}\), Bromine (Br) has a charge of \(Br^{-}\).
• Calcium (Ca) has a charge of \(Ca^{2+}\), Sulfur (S) has a charge of \(S^{2 -}\).
• Potassium (K) has a charge of \(K^{+}\), Oxygen (O) has a charge of \(O^{2 -}\).

Step2: Apply criss - cross rule

• For Gallium Bromide:
• Criss - cross the charges: \(Ga_{1}Br_{3}\) (since \(3\) from \(Ga^{3+}\) goes to \(Br\) and \(1\) from \(Br^{-}\) goes to \(Ga\)).
• For Calcium Sulfide:
• Criss - cross the charges: \(Ca_{2}S_{2}\), then simplify to \(CaS\) (divide subscripts by \(2\)).
• For Potassium Oxide:
• Criss - cross the charges: \(K_{2}O_{1}\).

Answer:

• Gallium Bromide: \(GaBr_{3}\)
• Calcium Sulfide: \(CaS\)
• Potassium Oxide: \(K_{2}O\)