Element → H →F→Cl → Co & Ni → Br → Pd →I→ Pt & Ir
No → 1→8→15→22→29→36→42→50 This classification belongs to...
(A) Dobereiner (B) Newlands (C) Mendeleeff (D) Moseley
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Element → H →F→Cl → Co & Ni → Br → Pd →I→ Pt & Ir
No → 1→8→15→22→29→36→42→50 This classification belongs to C) Mendeleeff
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The exact answer is Option(C) Mendaleeff
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