Use the information in the square to answer the questions about copper. A purple box has C u at the center and 29 above. Below it says copper and below that 63.55. How many protons are in an atom of copper? How many electrons are in an atom of copper? How many neutrons are in an atom of copper? Round your answer to the nearest whole number.

Match the mixture with the substance// i really need on this guys (it’s a pic btw)

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.

Ascientist measures the speed of sound in a monatomic gas to be 449 m/s at 20∘c. what is the molar mass of this gas?