Which of the following statements about density is TRUE?

Which of the following statements is TRUE? 1.   and  have the same number of neutrons. 2.  and are isotopes of one another because they have the same mass number. 3. 

Rubidium (Rb), is likely to form what kind of ion?

Which of the following statements about atomic structure is FALSE?

Which one the following statements concerning matter is correct?

What is the molar mass of ammonium carbonate [(NH4)2CO3]?

The atomic mass listed for an element on the periodic table is_________.

Which of the following statements about chemical reactions is FALSE?

Calculate the atomic mass of element “X” in amu, if it has 2 naturally occurring isotopes with the following masses and natural abundances:                     X-45                      44.8776 amu   32.88%                   X-47                      46.9443 amu   67.12%

Ernest Rutherford’s experiment with the gold foil was responsible for which important discovery?