What is the mass number of an atom if it has 5 protons 5 neturons?

Science needed ! running out of will give brainliest 1.) the atomic emission spectrum of hydrogen includes four visible colors of light: red, blue-green, indigo, and violet. which color of light corresponds with the largest electron transition? a.) blue-green b.) red c.)indigo d.) violet 2.) hydrogen’s emission spectrum includes a line of violet light that has a frequency of 7.31∗1014 hz. what is the energy (in joules) a photon of the violet light?