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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.
Explain about the Toxicity of pyridoxine? Though toxicity related to pyridoxine intake are rare, but use of high doses of pyridoxine for the treatment of pre-menstrual syndrom
T AXONOMIC EVIDENCES - Taxonomy is the classification of organism. The gradual development in the complexity of organisms with specialized characters from simpler organisms
CONDITIONE D REFLEX - Response which is achieved by training is conditioned reflex. I. P. Pavlov in 1920 displayed it by experimenting on dog. These are voluntary in
COMMON DISEASE OF CATTLE & BUFFALOES - 1 . Anthrax - Its symptoms are high temp, painless & warmthless swellings on different body parts. Bloody discharge from na
Q. Causes of Mitral Regurgitation? Mitral regurgitation is the most common valvular abnormality seen in clinical practice. Different disease processes leading to mitral regurgi
Skeleton - Animal Kingdom You all know that the skeleton forms the framework of the body of different organisms in the animal kingdom. Besides giving shape to the animal, it a
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Vitamin B Complex The vitamin B complex comprises the vitamins B 1 , B 2 , B 6 and B 12 as well as the vitamin B factors biotin, folic acid, nicotinic acid and its amide as w
Impoundments - Lentic Ecosystems We have so far discussed natural lakes. In addition to these there are a number of lakes both small and large artificially created by man cal
Why do fats have thermal isolation properties? Triglycerides are weak heat conductors and in addition they form thick layers of fat tissue when accumulated by the organism. Tha
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