P block element
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On heating ,borax loses water of crystallisation and swells up to form fluffy mass. On further heating it melts to give a clear liquid which solidifies to a transparent glossy bead consisting of sodium metaborate and boric unhydride.
Na2B4O7. 10H₂O—>Na₂B₄O7—>2NaBO₂ + B₂O₃