For the reaction 2na(s) + cl2(g) -> 2nacl(s), how many grams of nacl could be produced from 20 l of cl2 (at stp)?

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.

Nonmetal halogen family atmoic mass 35

List four observations that indicate that a chemical reaction may be taking place