Elements that do not have full outer electron shells will donate, share, or take electrons from other atoms. Choose the items that have the correct binary ionic formula. (Choose 3)

Question

Responses
A Lithium and fluorine form LiFLithium and fluorine form LiF
B Potassium and sulfur form KS2Potassium and sulfur form KS 2
C Magnesium and chlorine form MgCl2Magnesium and chlorine form MgCl 2
D Sodium and calcium form Na2CaSodium and calcium form Na 2 Ca
E Strontium and oxygen form Sr2O2Strontium and oxygen form Sr 2 O 2
F Beryllium and nitrogen form Be3N2

Answer 1

The correct binary ionic formulas from the options provided are:

A. Lithium and fluorine form LiF
C. Magnesium and chlorine form MgCl₂
F. Beryllium and nitrogen form Be₃N₂

Here’s a brief explanation for each:

• A. LiF: Lithium (Li) has a +1 charge and fluorine (F) has a -1 charge, so they combine in a 1:1 ratio.
• C. MgCl₂: Magnesium (Mg) has a +2 charge and chlorine (Cl) has a -1 charge, so two chlorine atoms are needed for each magnesium atom, resulting in the formula MgCl₂.
• F. Be₃N₂: Beryllium (Be) has a +2 charge and nitrogen (N) typically has a -3 charge, requiring three beryllium atoms to balance the charge of two nitrogen atoms, resulting in Be₃N₂.

The incorrect formulas are:

B. Potassium and sulfur should form K₂S, not KS₂.
D. Sodium and calcium do not form Na₂Ca; instead, sodium and calcium would not form a stable ionic compound directly.
E. Strontium and oxygen should form SrO, not Sr₂O₂.