Find the thermal-equilibrium electron and hole concentrations in silicon with doping concentrations of Na 7 1015 cm3 and Na 3 1015 cm3 for (a) T 250 K and (b) T 400 K.

8

explanation:

each principal energy level above the first contains one s orbital and three p orbitals. a set of three p orbitals, called the p sublevel, can hold a maximum of six electrons. therefore, the second level can contain a maximum of eight electrons - that is, two in the s orbital and 6 in the three p orbitals.

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the answer is either b or c

wher is the rest of the question

the objects have the same charge.