सोडियम परमाणु में कोर इलेक्ट्रॉन की संख्या है ? - What is the number of core electrons in sodium atom? - Sodium Parmanu Me Core Electron Ki Sankhya Hai ? General Science in hindi, Physics 2 question answers in hindi pdf 8 questions in hindi, Know About 1 General Science online test General Science notes in hindi quiz book 10
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