Question

9. What is the name of the alkali metal that is in Period 5?

a. iodine

b. rubidium

c. strontium

d. xenon

e. ytrium

10. which of the following sets of elements would be expected to have very similar chemical properties for all elements?

Br, Cl, Co, Cu, F, Fe, Ni, S, Zn

a. F, Cl, S, Br

b. F, Cl, Br

c. Fe, Co, Ni, Cu, Zn

d. Fe, Ni, Zn

e. Co, Cu, Zn

11. The element nitrogen has two stable isotopes, nitrogen-14 with a mass of 14.00 amu and nitrogen-15 with a mass of 15.00 amu. From the atomic mass of nitrogen on the Periodic Table, one can conclude that:

a. both isotopes have the same percent natural abundance

b. there is an isotope of nitrogen with an atomic mass of 14.01 amu

c. nitrogen-14 has the highest percent natural abundance

d. nitrogen-15 has the highest percent natural abundance

12. What is the chemical formula for nitric acid

a. HNO2

B. HNO3

C. HN04

D. H2NO3

E. H2NO2