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प्रश्न
Elements having valency 'one' are :
विकल्प
always metals
always non-metals
always metalloids
either metals or non-metals
MCQ
उत्तर
either metals or non-metals
Elements with valency 1 can be either metals or non-metals.
When an atom loses one electron to gain stability, it is a metal. When an atom gains an electron to complete its octet it is a non-metal.
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