Which of the following is not a donor atom?
A). Phosphorus
B). Antimony
C). Arsenic
D). Aluminium
Aluminium
Aluminium is an acceptor atom, an impurity atom in a semiconductor, which can accept or take up one or more electrons from the crystal and become negatively charged.In semiconductor physics. It is a dopant atom that when added to a semiconductor can form a p-type region. 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. Other trivalent dopants include indium (In) and gallium (Ga).
1. The acid which is secreted by the glands in the stomach wall is
2. Cement is usually a mixture of
3. Natural rubber is the polymer of :
4. A change in which one or more new substances are formed is called _________.
5. The chiefsource for the production of nitrogeneous fertilizers is :