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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.
Define Commodity Topics of Food Science? All issues of food science and technology of certain commodity groups, including milk and milk products (fluid milk and derivatives, ic
What is the inactivation of the X chromosome? What is a Barr body? Inactivation of the X chromosome is a phenomenon that happens in women. As women have two X chromosomes only
What is Active site Active site : The site on the surface of an enzyme to which substrate or substrates bind.
Q. What are the cells responsible for the production of antibodies? The cells that produce antibodies that is the cells of the humoral immune system are the B lymphocytes (B ce
Byproducts of the food industry, such as coffee residues, fruit pulp and cocoa meal are of low energy value, but are relatively high in nitrogen. In additional, animal excreta tend
#Predict: In order to be able to energize a transport protein by phosphorylation (by addition of a phosphate group from ATP), the portion of the protein to which the phosphate grou
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Define Determinants of Food Security - Public Nutrition? We learnt above that there is also a qualitative aspect to food security, which compels the perception of food not only
Shortness of Breath It is a subjective sensation of being unable too draw in enough air to breathe. Most often, this is associated with congestive cardiac failure and may
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