Question

When the following combinations of elements are combined chemically, which will be held together by ionic bonds?

I. Rb + S
II. S + Sr
III. S + F
a) I and II
b) I and III
c) II and III
d) I, II, and III

Answer 1

A compound that contains ions and is held together by ionic bonds is called an ionic compound. When a metal is combined with one or more nonmetals, the compound is usually ionic. The correct combinations of elements that will be held together by ionic bonds are I and II.

Step-by-step explanation:

A compound that contains ions and is held together by ionic bonds is called an ionic compound. When a metal is combined with one or more nonmetals, the compound is usually ionic. So, to determine which combinations of elements will be held together by ionic bonds, we need to look for combinations of metals and nonmetals.

Examining the given combinations:

1. Rb + S: Rb is a metal and S is a nonmetal, so this combination will form an ionic bond.
2. S + Sr: S is a nonmetal and Sr is a metal, so this combination will form an ionic bond.
3. S + F: Both elements, S and F, are nonmetals, so this combination will NOT form an ionic bond.

Based on the analysis, the correct answer is (a) I and II.