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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.
Q. What is the difference between the reptile heart and the amphibian heart? The reptiles have incomplete and double circulation three heart chambers two atria and one ventricl
Advise on Rest, recreation, sleep The patient should take enough rest and get good sleep. Restrict the visitors so that the patient can get enough rest. Not to strain th
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What is karyotype? The name karyotype is given to the set of chromosomes of an individual, generally when visualized and identified under the microscope. The visualization usua
Explain Environmental Sampling - Methods and Techniques? Environmental sampling can be done for total microbial load or for some specific pathogens or spoilage organisms. The m
How are gases exchanged in sponges? The gas exchange in sponges occurs by diffusion from the external to the cells that absorb molecular oxygen and release carbon dioxide.
Q. What do you mean by Hemichordata ? Hemichordates re vermiform (worm-like) animals which have few characters like those of the chordates, hence the name hemichordata (hemi :
Indicating the name and respective ploidy of each involved cell how can the formation of sperm cells from germ cells be described? The formation of sperm cells, or spermatogene
How will you evaluate periimplant marginal tissues? Evaluation of the perimplant Marginal tissues can be done by using following parameters: i) Assessing the marginal mucos
What are cotyledons? Cotyledons or else seed leaves are structures formed by the embryo of angiosperms to absorb nutrients from the endosperm and to store and transfer these nu
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