Question

a binary ionic compound is chemically formed by the electrostatic attraction between a metal and a ____
your answer

which of the following is the correct definition of a binary ionic compound?
a compound formed by three or more different elements.
a compound formed between two metals.
a compound formed between two nonmetals.
a compound formed between a metal cation and a nonmetal anion.

what is the expected charge of an ion formed from a group 1 element like lithium (li)?
your answer

what is the expected charge of an ion formed from a group 17 element like chlorine (cl)?
your answer

explain in one sentence why the name for the na⁺ ion is sodium and not sodide?

Explanation:

First Question (Fill - in - the - blank)

Binary ionic compounds are formed by the electrostatic attraction between a metal (which forms a cation) and a nonmetal (which forms an anion). So the blank should be filled with "nonmetal".

• Option 1: A compound with three or more elements is not binary (binary means two elements), so this is wrong.
• Option 2: Compounds between two metals are alloys (metallic bonding), not ionic compounds, so this is wrong.
• Option 3: Compounds between two nonmetals are covalent compounds, not ionic, so this is wrong.
• Option 4: Binary ionic compounds are formed between a metal cation (from the metal) and a nonmetal anion (from the nonmetal), so this is correct.

Group 1 elements (alkali metals) have 1 valence electron. They tend to lose this electron to achieve a stable electron configuration, forming a cation with a charge of +1. So the expected charge of a lithium ion ($Li^+$) is +1.

Answer:

nonmetal

Second Question (Multiple - choice)