Suppose that a person has an average heart rate of 72.0 beats/min. how many beats does he or she have in 2.0 y? in 2.00 y? in 2.000 y?

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.

Which component of the earth’s atmosphere is decreased due to photosynthesis?

3. which is not a primary color of light? blue red green yellow