Discussion
Which of the following elements behave chemically both as a metal and a non metal?
Answer: A
Boron behaves both as a metal and as a non-metal.
It is a metalloid: it has a lustrous, hard, semiconducting elemental form, yet its oxide \(\mathrm{B_2O_3}\) is acidic and its chemistry is dominated by covalent bonding. Argon is a noble gas, carbon a non-metal and mercury a metal.
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