What is meant by "the energy of an electron is quantized"?

a. the quantity of electron energy can be measured.
b. each electron around an atom has a discrete measure of energy.
c. the quantity of electron energy changes as it moves around the nucleus.
d. all of the above

Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal. b. he is determining chemical properties that are sufficient to identify the metal. c. he is determining physical properties that are insufficient to identify the metal. d. he is determining chemical properties that are insufficient to identify the metal.

20 pts ‼️ an unmanned spacecraft travels to mars. mars has a lower strength of gravity than earth. where in the image is the spacecraft’s weight the greatest?

What is the molecular weight of copper