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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.
write the classification of chordata?
Individual components of biodiversity provide an unbeliev able wide range of products that are used to enhance the lives of people in all countries of the world. It is the diversit
(1) The 7,893 bp plasmid shown below was digested with a series of restriction enzymes (P = PstI, B = BamHI, S = SalI, X = XbaI). Answer the questions below. a) Indicate
How does the presence of thick, cloudy, yellowish fluid in the peritoneal cavity differ from the normal state?
What are Polysaccharides? Polymers of simple sugars are known as Polysaccharides. Several polysaccharides, unlike sugars, are insoluble in water. Dietary fibre includes polysac
After stinging its victim, the honeybee leaves behind the barbed stinger, poison sac, and muscles that continue to pump venom into the wound. A study compared two methods of removi
What are abiotic factors? The Abiotic factors are the nonliving elements that constitute a given environment, like light, temperature, water, minerals, gases, atmospheric press
Q. Define the Role of Protein and Purines? Cellular materials of plants, grams and legumes and animal glandular organ meats (liver, pancreas brain, kidneys) contain nucleoprote
Motor Control in Annelids and Arthropods In annelids and arthropods generally, individual metameric ganglia of the ventral nerve cord are capable of initiating and keep locomo
How can the abundance and diversity of living beings in the tropical forests be explained? The biodiversity of these ecosystems can be defined by the great availability of the
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