If 81 J of heat is added to a pure gold with a mass of 20g, what is the temperature change? The specific heat capacity of gold is 0.128 J/g

In an energy pyramid, which level has the most available energy?

Which statement is true about ionic compounds?

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.