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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 Spontaneous Closure of Defects in details? Some defects have a tendency towards spontaneous closure and this can influence the timing of intervention. The defects known
PENIS - Intromittent organ. Erectile, its apex is penis glanse. Covered by prepuce (part of skin). Main function is insemination (To transfer sperms in vagina in deep).
Light and Heavy Soils The presence of silt and especially clay in a soil imparts to it a fine texture, and a slow water and air movement. Such a soil is highly plastic becoming
Define Drug effects on Lipid Metabolism? Drugs can affect the metabolism of various essential nutrients in the body. These impairments are highlighted herewith: Lipid metabo
Autoradiography Autoradiography is a modification of the radioactive tracer technique. In this technique, the radioactivity is detected by a thin film of photographic emulsion
a) What does secondary productivity in an ecosystem indicate? b) List any two factors by which productivity is limited in aquatic ecosystems
Q. How does the circulatory system participate in the functioning of the endocrine system? The circulatory system is basic for the functioning of the endocrine system and the b
Resistance Acyclovir-resistant HSV occurs mainly in immunocom- promised patients treated with the drug; isolates are usually also resistant to valacyclovir and famciclovir. Re
Ensuring Food Safety It is now well-known that the end product inspection and testing does not provide safety of food. It has inherent limitation of mapping the potential ha
Ciliates - Parasitic Protozoan The only ciliate of medical and veterinary importance is Balantidium coli which inhabit the large intestine of man, apes, monkeys and pigs. B. c
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