6 spills and 100 squares If each spill represents one year, what is the half-life of the square?

If equal masses of the listed metals were collected , which would have a greatest volume ? a. aluminum 2.70,b. zinc7.14,c. copper 8.92,d. lead 11.34

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 element forms an ionic bond with flourine? 1) fluorine 2) carbon 3) potassium 4) oxygen