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Explain the Bohr's model?
Bohr's Model : Electrons move around the nucleus at tremendous speeds and occupy most of the space in an atom. The exact position or location of an electron at any given moment can only be predicted on the basis of probability. In a widely accepted model of the atom originally proposed by Neils Bohr, electrons move in spherical spaces called orbitals, or shells, which correspond to different energy levels. Electrons are distributed according to their energy levels, with the higher energy electrons residing in the outer shells. The innermost shell contains only 2 electrons. In common elements, the next outer shells contain 8 electrons each.
Atoms either gain, lose, or share electrons in the outer shells. Because the outer shells of many atoms are incomplete, most atoms will interact with other atoms during chemical reactions to achieve stable outer shells. The number of electrons that an atom must either gain, lose, or share to complete the outer shell is known as its valence, or oxidation number. For example, carbon has six electrons, two in its first energy level and four in the outer level. Thus, it can form a stable outer shell by gaining, losing, or sharing four electrons to complete its outer shell when it joins, or bonds, with another atom or atoms to form a compound. The following table lists the oxidation numbers of some important ions frequently used in Biology.
Ontogeny: This is the study of history of an individual. Ontogeny is also known as ontogenesis and morphogenesis. Ontogeny describes the origin or the development of an organism -
Pathphysiology Streptococcal upper respiratory infection leads to production of antibodies. An abnormal immunological response to the upper respiratory infection with Beta- h
Which is the plant tissue responsible for the filling of the space between other tissues? The plant-filling tissue is generically known as parenchyma. The plant parenchyma can
REGUL A TIV E THEORY It was propounded by Hens Driesch. He performed experiments on the eggs of sea urchin similar to the experiments performed by Roux. He observed
wrt spoilage
1. The genes for ruby eyes (rb), tan body (t) and cut wings (ct) are all found on the X-chromosome of Drosophila melanogaster. All of these are recessive traits. They map in the or
Could any of the following features be useful in a gateway vector; (i) Origin of replication (ii) multiple cloning site (iii) blue/white selection (iv) M13 forward and rev
Q. What are intraspecific and interspecific ecological interactions? The Intraspecific ecological interactions are those between individuals of the similar species. The Intersp
Q. Nutritional Management in Inflammatory Bowel Disease? Adequacy of nutritional needs and minimizing stress on the inflamed or narrowed segment of the bowel are the main princ
What is Schistosomiasis? Explain in brief. A disease cause by the trematode parasite Schistosoma found around the world. Numerous species are responsible for diseases ranging f
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