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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.
List host factor which play important role in implant survival. Host factors: a) Medical status of the patient b) Habits - Smoking - Parafunctional habits c) O
Q. Which are the major positive ions found in living beings? The major cations found in living beings are the calcium cation (Ca++), the potassium cation (K+), the sodium catio
mitochondria?
Evolution of Metazoa The sponges, coming under phylum Porifera are the closest to Protista, and can perhaps be regarded even as a colony of protists rather than being multicel
economic importance of mollusca
What is Post Myocardial Infarction Ventricular Septal Defect ? Post Myocardial Infarction Ventricular Septal Defect (Septal Rupture) The correct terminology is septal
Stage 2 implant surgery After evaluating the status of the implant, stage two procedure is carried out to bring forth a communication of the implant to the oral cavity by surgi
How the digestive system work?
Explain the Crestal Bone Levels Crestal Bone Levels: Bone levels should be assessed on the mesial and distal surfaces of implants. Any changes between visits should be documen
Define the term Underweight? Just as overweight is the result of a positive energy balance irrespective of the etiology, underweight results when the energy balance is negative
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