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Boron
The only nonmetallic element in group 13, boron has a strong tendency to covalent bonding. It's lonely complex structural chemistry arises from the (2s)2(2p)1 configuration, which produce it one less valence electron than the number of orbitals in the valence shell. Simple compounds such as BCl3 have an incomplete octet and are strong Lewis acids, but boron usually accommodates its electron deficiency by forming clusters with multicenter bonding.
Boron is not a common element on the Earth overall (about 9 p.p.m. in the crust) but happens in concentrated deposits of borate minerals such as borax Na2[B4O5(OH)4].8H2O, associated with former volcanic activity or hot springs. It is used mostly as borates in enamels, glasses, detergents and cosmetics, and in lesser amounts in metallurgy.
Question: a) If you were a newly appointed environmental engineer in a wastewater treatment plant and one of your tasks was to characterise the wastewater. According to you,
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Which of the following set of quantum numbers belong to highest energy: (1) n=4, l=0, m=0, s= +1/2 (2) n=3, l=0, m=0, s= +1/2 (3) n=3 l=1, m=1, s
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please tell the observation & inference, when ammonium phosphate (NH4)3PO4 undergoes charcoal cavity test & cobalt nitrate test.....
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