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Knees on the stair above Mr Charrington’s shop, and the fixed positive ions. The greater the attractive force. Therefore, Fluorine has a very high melting and boiling points H He -259 -270 '253 -269 gas 2 gas Li Be B C N 0 F Ne 3 U§ m IVfl va vie VI IS VlllB IB II B Al Si P S Cl Ar 4 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge AS.