(same table as the last question) Three students measured the length of a stamp that has is exactly 2.71 cm long and recorded their measurements in the table
below. What is the relative (percent) error for Student 1's average? *

If the particles in a sample of matter have an orderly arrangement and move only in place, the sample is a

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.

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)