Answer:
This process is known as doping. It can be done by adding either of two types of impurity to the crystal. (A) By adding electron rich impurities i.e., group 15 elements to the silicon and germanium of group 14 elements.
Well actully the thunder is heard before the lightning because light travles faster than sound
Answer:
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Explanation:
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C
2 to 3
2 of al3-
And 3 of s2+
Equals 0
