When Metal X bonds with Iodine the resulting compound has the formula XI2. To which of the following groups would Metal X most likely belong?
A. Alkali metals
B. Alkaline Earth metals
C. Halogens
D. Noble Gases

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

Which compound contain an iron with a 3+ charge

In 2002, the rare earth elements mine in mountain pass, california was closed because