Do you think surface tension affects the density column, and if so, how?

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.

Consider this initial-rate data at a certain temperature for the reaction described by

In which block of the periodic table is uranium (u) found? s blockd blockp blockf block