Question

the correct chemical formula for potassium iodide is: *
options: ki₃, ki, pi₃, pi

in the compound magnesium phosphide, how many total atoms are represented in the smallest whole - number unit of the compound?
your answer

write the chemical formula for barium fluoride. *
your answer

a student incorrectly named the compound nacl as sodium chloride - ide. identify the specific error in the student’s naming attempt and explain why it is wrong based on the rules for naming binary ionic compounds.
your answer

what is the name of the compound that forms between a k⁺ ion and an o²⁻ ion?

Explanation:

First Sub - Question (Chemical formula of potassium iodide)

Step 1: Determine ions

Potassium (K) forms \(K^+\) ion, iodine (I) forms \(I^-\) ion.

Step 2: Balance charges

To form a neutral compound, one \(K^+\) and one \(I^-\) combine. So the formula is \(KI\).

Step 1: Find formula of magnesium phosphide

Magnesium (\(Mg\)) forms \(Mg^{2+}\), phosphide is \(P^{3 -}\). Using criss - cross method, the formula is \(Mg_3P_2\).

Step 2: Calculate total atoms

In \(Mg_3P_2\), number of Mg atoms = 3, number of P atoms = 2. Total atoms = \(3 + 2=5\).

Step 1: Identify ions

Barium (\(Ba\)) forms \(Ba^{2+}\), fluoride (\(F\)) forms \(F^-\).

Step 2: Balance charges

To balance \(2+\) and \(1-\) charges, we need 2 \(F^-\) for 1 \(Ba^{2+}\). So the formula is \(BaF_2\).

Answer:

B. KI (assuming the options are labeled with B as KI, if the original options had KI as one of them with label B)

Second Sub - Question (Total atoms in magnesium phosphide's smallest unit)