General Science- 18Ar⁴⁰ , 19K⁴⁰ Tatha 20Ca⁴⁰ Hai ?

Q.11103: 18Ar⁴⁰ , 19K⁴⁰ तथा 20Ca⁴⁰ है ?
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18Ar⁴⁰ , 19K⁴⁰ तथा 20Ca⁴⁰ है ? - 18Ar⁴⁰, 19K⁴⁰ and 20Ca⁴⁰? - 18Ar⁴⁰ , 19K⁴⁰ Tatha 20Ca⁴⁰ Hai ? General Science in hindi,   Sambharik question answers in hindi pdf  Samneutronic questions in hindi, Know About Samasthanik General Science online test General Science notes in hindi quiz book    Sam Electronic