State the number of electrons lost or gained when the following elements form ions:

e. Rb

Write the symbol for the ion of each of the following:

b. barium

Write the names for each of the following ions:

a. Li⁺

Write the names for each of the following ions:

d. P^3-

Write the names for each of the following ions:

b. Sr²⁺

Write the correct ionic formula for the compound formed between each of the following pairs of ions:

e. Al³⁺ and S^2-

Write the correct ionic formula for the compound formed between each of the following pairs of ions:

b. Ca²⁺ and S^2-

Write the symbols for the ions, and the correct formula for the ionic compound formed by each of the following:

c. sodium and phosphorus

Write the name for each of the following ions (include the Roman numeral when necessary):

e. Au³⁺

Write the symbol for the cation in each of the following ionic compounds:

a. FeCl₂

Write the formula including the charge for each of the following polyatomic ions:

b. sulfite

Name the following polyatomic ions:

c. HSO₃^-

Write the formula for the polyatomic ion and name each of the following compounds:

d. Fe(HCO₃)₃

Draw the Lewis structure for each of the following molecules:

d. ClNO₂ (N is the central atom)

Which electronegativity difference (a, b, or c) would you expect for a nonpolar covalent bond?

a. from 0.0 to 0.4

b. from 0.5 to 1.8

c. from 1.9 to 3.3

For each of the following bonds, indicate the positive end with 𝛿⁺ and the negative end with 𝛿⁻ . Draw an arrow to show the dipole for each.

a. N and F

Choose the shape (1 to 6) that matches each of the following descriptions (a to c):

1. linear

2. bent (109°)

3. trigonal planar

4. bent (120°)

5. trigonal pyramidal

6. tetrahedral

b. a molecule with a central atom that has four electron groups and three bonded atoms

Complete each of the following statements for a molecule of H₂S:

c. The number of atoms attached to the central S atom is _______.

Compare the Lewis structures of CF₄ and NF₃ Why do these molecules have different shapes?

Compare the Lewis structures of CH₄ and H₂O Why do these molecules have similar bond angles but different molecular shapes?

Why is CCl₄ a nonpolar molecule, but is PCl₃ a polar molecule?

Identify the major type of intermolecular forces between the particles of each of the following:

b. MgF₂

How does the octet rule explain the formation of a magnesium ion?

What noble gas has the same electron arrangement as the magnesium ion?

Why are Group 1A (1) and Group 2A (2) elements found in many compounds, but not Group 8A (18) elements?

Consider the following Lewis symbols for elements X and Y:

b. Will a compound of X and Y be ionic or molecular?

Consider the following Lewis symbols for elements X and Y:

c. What ions would be formed by X and Y?