What is the energy of a photon emitted by the transition from the Ni=5 to the Nf=2 of a Chlorine atom? Express your answer in joules.​

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

it means there are 3 atoms of oxygen

the electron configuration that you gave me has 16 electrons ergo it has 16 protons ergo it is the element sulfur.