Metalloid which is having 3 electrons in the valance shell is boron. option A is correct.
Metalloids are those which show the property of both the metals and nonmetals in other words we can say that they will always show intermediate properties of both the metal and nonmetal
They are also known as semiconductors and their conduction can be increased by doping in which we add some impurities to increase their conductivity. By adding some metals to increase the conductivity or by adding some nonmetals to decrease the conductivity.
Boron is mostly in a crystalline solid state and some other major components of it’s are boric powder etc. They are situated in the 13th group of the periodic table and have 3 electrons in their outermost shell and are highly reactive and unstable due to partially filled s orbital
Therefore, they have 3 electrons in their outermost shell. Option A is correct.
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