Which of the following is a chemical property? A. Gallium metal melts in your hand.
B. Platinum does not react with oxygen at room temperature.
C. The page of the textbook is white.
D. The copper sheets that form the "skin" of the Statue of Liberty
have acquired a greenish coating over the years.

An electron moved from shell n = 2 to shell n = 1. what most likely happened during the transition? a fraction of a photon was added. a photon of energy was absorbed. a fraction of a photon was removed. a photon of energy was released.

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.

The atomic number, or number, is the described as the number of in the nucleus of an chemical element.