किसी तत्व के परमाणु में 2 प्रोटॉन , दो न्यूट्रॉन और 2 इलेक्ट्रॉन हों तो उस तत्व की द्रव्यमान संख्या कितनी होगी ? - If the atom of an element has 2 protons, two neutrons and 2 electrons, then what will be the mass number of that element? - Kisi Tatv Ke Parmanu Me 2 Proton , Do Neutron Aur 2 Electron Ho To Us Tatv Ki Dravyamaan Sankhya Kitni Hogi ? General Science in hindi, Physics 4 question answers in hindi pdf 6 questions in hindi, Know About 2 General Science online test General Science notes in hindi quiz book 8
विवरण दे