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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.
before stem cuttings are planted the cut end of the stem is often dipped in a hormone powder .what is the point of this?
SHARPS : Cuts due to careless handling of sharps such as sectioning razors, microtome blades etc. are probably the most common cause of injury in the biology lab. The only real re
Explain in brief Chitinous? A structure which is composed of chitin, a complex carbohydrate composed of linearly arranged Nacetyl-glucosamine units. Chitin is a characteristic
Q. Determine the fructose to glucose ratio in honey? This activity will help you to: • check the given samples of honey for any adulteration with commercial sugar
general characteristic of phylum protozoa
Determine the intracellular concentration of TRVA Consider Neuron B in the frog central nervous system whose plasma membrane has a previously unknown channel that is selectly c
Write up your own Matlab program to do the job described by Show">http://www.avatar.se/molbioinfo2001/dynprog/adv_dynamic.html Show a few examples, your code does work. You wil
Which of the following statements concerning enzymes is false? a. They function as catalysts b. The active site of an enzyme has a shape that is specific for its c. Many e
Assessment While assessing the patient with rheumatic fever, a detailed history including, problematic environmental factors or recent exposure to streptococcal infection is
Radial Artery (RA) : Patency of RA is less than that of Ih4.A but much superior to a venous graft. One of the studies showed 90 per cent patency at 13 months and 83
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