Notes
वर्ग-IA के तत्व …
वर्ग-IA के तत्व –
(1) हाइड्रोजन
(2) लीथियम
(3) सोडियम
(4) पोटैशियम
(5) सीजियम
(6) फ्रैनशियम
(7) रूबिडियम
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