Notes
वर्ग I A के तत्व …
वर्ग I A के तत्व –(1) हाइड्रोजन
(2) लिथियम
(3) सोडियम
(4) पोटैशियम
(5) रूबिडियम
(6) सीजियम
(7) फ्रान्सियम
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