Why even no.Of proton and electron in an atom has 0 spin number?
Answers
Odd-mass-number nuclides always have an even number of either neutrons or protons, the even-numbered particles usually form part of a "core" in the nucleus with a spin of zero.
Hope this will help you...
Protons and neutrons each have an intrinsic angular momentum reflected in a quantity called “spin,” which has no classical analog. Both protons and neutrons have spin 1/2, but the direction can be either up or down. This is vaguely similar to a wheel being able to spin either clockwise or counterclockwise, but definitely don’t carry this analogy too far.
When a nucleus has an even number of protons and an even number of neutrons, the spin-up protons are able to pair off with the spin-down protons and the spin-up neutrons pair off with the spin-down neutrons. These interactions make the nucleus more tightly bound, lowering its total energy and making it more stable.