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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.
Collagen Helix Collagen has a large amount of glycine (25%) and proline (and hydroxyproline, 25%). They run parallel, form a right handed super-helix that is stabilized b
How different are animal cells from plant cells? Whereas plant cells are eukaryotic, autotrophic, photosynthetic and have chloroplasts and cell wall, the animal cells are eukar
What is the meaning of Cardiovascular System ? The cardiovascular system takes care of the distribution of gases, nutrients, hormones, immune elements, and the removal of waste
Lotic Ecosystems Rivers The lotic or flowing water habitats include rivers streams, brooks etc. The most outstanding features of such habitats is the continuously flowing wat
advantages of cuticle of anthropodes
Syngamy and Triple Fusion After traversing through the stylar region, the ultimate destination of the pollen tube is to reach the female gametophyte and release the male game
Which of the below are skin receptors in humans which are sensitive to heat? Are they: a) End organs of Krause b) Meissner's corpuscles c) End organs of Ruffini d)
Forestry : It concerned with protection or development of forest and to explore the outcome or economic potential of forest. Forestry is the art or science of tree resources, inclu
Management Establish and maintain airway. Anticipate need for incubation if respiratory distress evident. Administer high humidified O 2 , using non-rebreather mask.
Suppuration High number of PMN cells have been detected around implants that are associated with severe signs of mucosal inflammation. Several studies have shown the presence o
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