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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 about the Ishihara's Plates of eyes Ishihara's Plates: Following plates are available- Transformation, Vanishing, Hidden Digit and Diagnostic plates. 1) The plates ar
Some organisms contain enzymes that condense a fatty alcohol and a fatty acid to generate wax esters. Draw decanol, plamitic acid (C16:0 fatty acid) and the resulting wax ester gen
Cardiac Veins The anterior cardiac consisting of vessels covering the anterior right ventricle, I drain into the right atrium. The great cardiac vein drains the blood form
When resheathing needles, simple precautions to prevent injuries are to: 1. use only one hand to scoop the cap 2. hold the sheath with a hemostat (suggested but will require
The nerve centres which control the body temperature and the urge for eating recontained in: 1. Hypothalamus 2. Pons 3. Cerebellum 4. Thalamus Hypothalamus is the
what is the modes of reproduction
Q. Bitter Taste? Bitterness is an inherent property of a substance. It is due to substances such as alkaloids present in food. For example, tannins present in tea, coffee, frui
In a comparative study you are examining two items, two scenarios, for Introduction to Professionalism you will be Examining two Regulated Health Professions. One will be the Colle
formulation of RDA
procees of excretion in reptiles
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