The electron density in a piece of silicon at room temperature is twice the intrinsic density.(a)calculate the hole density, and estimate the number of broken bonds in 1 cm3.(5+ 5points)(b)calculate the doping densityassuming only one type of dopants present in the semiconductor. what is the type of dopant atoms(donor or + 2points)(c)draw the energy band diagramand calculate (퐸퐹−퐸푖 points)

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.

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