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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.
Promotion - Stages of carcinogenesis The second stage or promotion is reversible and does not include changes in structure of DNA but rather in the expression of the genome of
Diploidy and Haploidy :: In the chromosomal complement given species not all the chromosomes are different from each other .In fact these are in pairs ,i.e. every two chrom
In which environments do bacteria live? Bacteria can be found in various environments throughout the planet. There are bacteria in the air, in fresh water, on the surface, in t
State the series of stimuli ERPs a series of stimuli such as tones or light flashes are presented to the participant, and the raw EEG for a precise one or two second period fol
Explain the Management of Middle - Third Perforation Same to coronal one-third perforation, except defects located more deeper from the access cavity. For successfully
What is a goiter? What is endemic goiter? How is this problem socially solved? Goiter is the abnormal enlargement of the thyroid gland. The goiter appears as a tumor in the ant
Define Hypoglycemic effects of Dietary Factor with antinutritional effect? Of the different carbohydrate foods tested for starch digestibility and blood glucose response, those
At 1 AM, an impermeable membrane separates a 1 liter solution of 1M NaCl in the left compartment from a 1 liter solution containing both 1M NaCl and 1M KCl in the right compartment
Compare and contrast replication, transcription, and translation based on the following criteria. Criteria Replication Transcription
Lens - Organogenesis of Eye and Limb There is much experimental proof that the lens formation in many species is dependent on the induction by the optic vesicle while it conta
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