The mass of a H-atom is less than the sum of the masses of a proton and electron. Why is this?

The mass of _3Li^7 nucleus is 0.042 a.m.u. less than the sum of masses of its nucleons.Find th binding energy per nucleon.

The mass of a proton is about 2,000 times the mass of an electron. An electron and a proton are injected into a uniform electric field at right agles to the direction of the field with the same initial kinetic energy. Then

The atom of an element is made up of 4 protons, 5 neutrons and 4 electrons. What are its atomic number and mass number ?

Sulphur has an atomic number 16 and a mass of 32. State the number of protons and neutrons in the nucleus of sulphur. Give a simple diagram to show the arrangement of electrons in an atom of sulphur.

Sum of the three sides of a triangle is less than the sum of its three altitudes.

If the alpha -decay of U^(238) is energetically allowed (i.e. the decay products have a total mass less than the mass of U^(238) ) from decaying all at once? Why is its half life so large?

Is it possible for an atom to have 12 protons and 13 electrons ? Explain

Energy equivalent to mass of an electron is: