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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.
What is parasitism? Parasitism is the ecological interaction in which a being lives at the expense of another. The parasite often does not cause immediate death of the host sin
Q. What is the difference between spermatocyte II and spermatocyte I? The spermatocyte I (2n) undergoes the first division of meiosis (meiosis I) originating two spermatocyte I
What are the Biotolerant materials Biotolerant materials, are characterized by a thin fibrous tissue interface. The fibrous tissue layer develops as a result of the chemical pr
Define about the Spectroscopy- colorimetry? Spectroscopy, therefore, is the study of the absorption and emission of radiation by matter. Absorption Spectroscopy is usually used
L YMPH A TI C SYSTEM As 'Middle man' of circulation it mediates exchange between blood and the tissue. It is also a collecting system like venous system. Basically 'o
Formation and Role of Hypoblast Hypoblast is made as a result of two processes. First, some cells individually leave the blastoderm and move down via poly invagination into t
Explain the term Lipids? If somebody discovers that you have some knowledge of nutrition, you will be promptly shooted with two questions, first, "Oh! You really can tell how m
Partial Pericardiectomy : The approach can be either by a left anterolateral thoracotomy or median sternotomy. For pyogenic pericarditis with adhesions and loculations a par
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