You must show ALL calculations of answers attained to receive credit. Any form of cheating or copying will result in a zero grade on the assignment for all students involved. Please utilize periodic table located on BB for all problems where applicable. You must include the cover sheet located at the end of this assignment. You must box your final answers; work must be legible.

1. Complete the following table. (0.5 ea.)

2. Determine whether the following elements are metals, nonmetals, or metalloids. Please circle the correct answer. (0.25 ea.)

3. The horizontal rows of the periodic table are called .

4. An element has two naturally occurring isotopes. One has an abundance of 37.40% and an isotopic mass of 184.953 amu, and the other has an abundance of 62.60% and a mass of 186.956 amu. What is the atomic weight of the element?

5. The element antimony has only two naturally-occurring isotopes. One isotope has an abundance of 57.30% and an isotopic mass of 120.904 amu. The other has an abundance of 42.70% and an isotopic mass of 122.853 amu. Based on this data, what is the atomic weight of antimony?

6. Label which group on the periodic table the following elements belong. [Families: alkali metals, alkaline earth metals, transition metals, halogens, or noble gases]. (0.25 ea.)

Family

a. I

b. Li

c. Co

d. Rn

7. Name the following ionic compounds that contain metals that can only form one charge:

a. NaF

b. MgCl₂

c. Mg(OH)₂

d. Ag₂O

8. Write a formula for the ionic compound that forms between each pair of elements:

a. barium and oxygen

b. beryllium and chlorine

c. magnesium and sulfur

d. strontium and bromine

9. Name each ionic compound:

a. NH₄I

b. NaClO₂

c. Pb(C₂H₃O₂)₂

d. KClO₃

10. Write a formula for the compound that forms between barium and each polyatomic ion:

a. hydroxide

b. chromate

c. phosphate

d. cyanide

11. Determine the name from the formula:

a. iridium(III) bromide

b. potassium carbonate

c. cobalt(II) phosphate

d. copper(I) chloride

12. Name the following molecular compounds:

a. NF

b. N₃Cl₂

c. XeO₃

d. CCl₄

13. Write a formula for each molecular compound:

a. phosphorus trichloride

b. chlorine monoxide

c. disulfur tetrafluoride

d. diphosphorus pentasulfide

14. Write the formula for each acid:

a. hydrofluoric acid

b. carbonic acid

c. sulfurous acid

d. hydrocyanic acid

15. What is the formula mass for diboron tetrachloride?

16. What is the formula mass of copper (II) fluoride?