जिस तत्व के परमाणु में दो प्रोटॉन , दो न्यूट्रॉन और दो इलेक्ट्रॉन हों , उस तत्व का द्रव्यमान संख्या कितना होता है ? - What is the mass number of an element whose atom has two protons, two neutrons and two electrons? - Jis Tatv Ke Parmanu Me Do Proton , Do Neutron Aur Do Electron Ho , Us Tatv Ka Dravyamaan Sankhya Kitna Hota Hai ? 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
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