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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.
MN blood group in humans is under the control of two co-dominant alleles M and N. Blood typing results of a population having of 1349 individuals showed that: - 363 persons h
Determine about the National Adult Reading Test The National Adult Reading Test (NART; Nelson, 1982) allows the researcher to obtain an estimate of an individual's IQ prior to
The book that I rented is missing some pages. How can i get a replacement?
Sublimation is the process by which solid water changes directly to vapour phase without passing through the intervening liquid phase. The gradual disappearance of flakes of ice
Why Fish and Sea Foods are important for human Body? They are rich sources of proteins (20-25%) of a high biological value. Dry fishes contain more (60%) proteins since most of
Define General Characters and Classification of Arthropoda? These are metamerically segmented animals with an exoskeleton of cuticle. Scliizocoelic coelom is much reduced and is
Explain the Nerve Cell Structure and Function? Before studying the organization of the nervous system, we will look at the relationship between structure and function of nerve
Pneumonia Pneumonia is an inflammatory process in which there is consolidation in lung caused by exudates filing the alveolar spaces. Gas exchange cannot take place in the c
Q. What is the ecological importance of fungi? Fungi are decomposers and heterotrophs they break down dead beings and they actively participate in the recycling of organic mate
Explain Defensive Proteins These proteins protect against diseases. Antibodies are the example of defensive proteins. These combat bacteria and viruses. Also, immunoglobulins,
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