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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.
Fertilization is the fusion of the two gametes (sperm and ovum) to produce a zygote which develops into the new individual with a genetic heritage derived from both the parents. S
Explain Viscosity of Gastrointestinal Contents Delay Absorption? 1. Inadequate mixing of luminal contents due to increased viscosity may slow the movement of digestive enzymes
Q. Function of Adenosine in brain? Adenosine has four different receptor subtypes (A1, A2A, A2B and A3). Adenosine A2A receptors are concentrated in striatum. Adenosine recepto
Determine the importance of Calcium in soils Calcium in soils is usually abundant except in acid soils, which occur in humid areas due to excessive leaching. Deficiency of calc
Do you know what the recommendations for fibre are? Well, the crude fibre intake should be 14 g/1000 Kcal. For adult woman 25 g/day and for adult man 38 g/day is desirable.
Classification of Phytoestrogens? Phytoestrogens can be divided into 3 main classes: - Isoflavones, - Coumestans and - Lignans. All are diphenolic compounds with st
Define Interaction of Vitamin K with Vitamins A and E? Excess vitamin A interferes with vitamin K absorption while the a-tocopherol or vitamin E, as we have already studied ear
how does these phylem parasites????
Food require during thyphoid So remember the foods to be included are: Juices, soups, dal water, broths. Refined cereals and their products (e.g. maida, rava, bread, rice
Class of Subphylum Uniramia - Insecta Class Insecta consists of nearly a million described species. There are more species of insects as compared to all the other species of a
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