A black coloured element with ns^2 np^1 outer | vedclass

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(A) The element with $ns^2 np^1$ configuration is a member of Group $13$. Boron $(B)$ is a black-coloured non-metal that exists in crystalline and amo

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Boron

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(A) The element with $ns^2 np^1$ configuration is a member of Group $13$. Boron $(B)$ is a black-coloured non-metal that exists in crystalline and amorphous forms. Crystalline boron is very hard and unreactive towards air at room temperature. Amorphous boron reacts with oxygen in the air to form boron trioxide $(B_2O_3)$, which is acidic in nature: $4B(s) + 3O_2(g) \rightarrow 2B_2O_3(s)$ $B_2O_3$ further reacts with water to form boric acid: $B_2O_3(s) + 3H_2O(l) \rightarrow 2B(OH)_3(aq)$

$A$ black coloured element with $ns^2 np^1$ outer electronic configuration cannot react with air in its crystalline form. However, in amorphous form, it gives an oxide in air which is acidic in nature. Identify the element.

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