Which has higher energy: light with a 2 of 674 nm or light with a 1 of 480 nm? explain without doing any
calculations.

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.

If you have 5.25 grams of methane (ch4), how many grams of co2 will you produce ?

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.