Mercury contains 80 protons and 80 electrons and 120 neutrons. Its mass number is....................
Mass number = No. of protons + No. of neutrons = 80 + 120 = 200
What is mass number of an atom which contains 28 protons,28 electrons,and 34 neutrons?
If an atom of an element contains 17 electrons and 18 neutrons, find the number of protons, atomic number and mass number of the element.