Question

Which of the following is a trivalent element?
1) chromate
2) phosphate
3) silicate
4) none of above

Answer 1

Answer:

For example, when silicon (Si), having four valence electrons, needs to be doped as a p-type semiconductor, elements from group III like boron (B) or aluminium (Al), having three valence electrons, can be used. The latter elements are also called trivalent impurities.

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