Which of the following describes the importance of cyanobacteria to early earth atmosphere formation? a.) cyanobacteria released oxygen into the air, creating a protective ozone layer b.) cyanobacteria relased nitrogen into the air, creating a protective ozone layer c.) cyanobacteria absorbed excess oxygen from the air, creating proper amounts of atmospheric oxygen d.) cyanobacteria absorbed excess carbon dioxide from the air, creating a protective ozone layer

If an atom contains 11 protons in its nucleus, predict the element with the atomic number and electronic configuration. will the number of electrons remain the same during the chemical reaction in such an atom? explain.

The field between two charged parallel plates is kept constant. if the two plates are brought closer together, the potential difference between the two plates either a) decrease b) does not change c) increase?

Calculate the minimum energy required to remove one proton from the nucleus 126c. this is called the proton-removal energy. (hint: find the difference between the mass of a 126c nucleus and the mass of a proton plus the mass of the nucleus formed when a proton is removed from 126c.) express your answer with the appropriate units. emin e m i n = nothing nothing request answer part b how does the proton-removal energy for 126c compare to the binding energy per nucleon for 126c, calculated using eb=(zmh+nmn−azm)c2?