Notes
दीर्घ तत्व …
दीर्घ तत्व –
(1) कैल्शियम
(2) फॉस्फोरस
(3) गन्धक
(4) पोटैशियम
(5) क्लोरीन
(6) सोडियम
(7) मैग्नीशियम
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