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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.
Myeloid immunodeficiency causes phagocytic function, which is impaired. Those who are affected with this will undergo with enhance in susceptibility to bacterial infection.
P u l l orum disease (bacillary white diarrhea) This disease is caused by poultry-adapted strain of Salmonella genus- Salmonella Pullorum and considered an important hatc
Define Bioavailability of pyridoxine? A recent review by Gregory confirms that bioavailability of vitamin B 6 in a mixed diet is about 7570, with approximately 8% of this tot
Q. What is the kind of reproduction that occurs in roundworms? What usual feature do nematode sperm cells have? Nematodes reproduce sexually. The nematode sperm cell does not h
Q. What is the official name of pyruvic acid? Pyruvic acid is named as 2-oxopropanoic acid it is thus a molecule made of three linearly bound carbons with one extremity forming
The structure of leaves Borrow a microscope from another school, a doctor, or a hospital. Study the under- side of leaves and locate the breathing pores or stomata with the two
Q. Explain the Wash Technique used in sterilization process? Use of artificial nails is contraindicated as is use of colored nail polish. Nails should be short enough to allow
nissles granule found in
Ant-Nutritional Factors Limiting their Optimum Use The anti-nutritional factors (ANFs) are non-fibrous natural substances which occur as natural constituents of plants and anim
Carbomedics Valve : Almost similar to StJude Medical valve, his is a low profile bileaflet valve made of pyrolitic carbon. On echo cardiography four small jets of regurg
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