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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.
Functions of Stomata The cuticle forms outermost surface of the leaf and offers resistance to the evaporation of water vapour and entry of carbon dioxide necessary for photosy
Kyasanur forest disease Kyasanur forest disease (KFD) was first recognized in 1957 as a new disease entity affecting man and monkeys in Karnataka, India. The disease is named
P o lymerase chain reaction (PCR): The PCR technique enables the exponential amplification of nucleic acid sequences from any biological samples. In the last few ye
Explain the Occurrence of Vitamin C Vitamin C (ascorbic acid) is an active ingredient present in any animal or vegetable cell which occurs in the plant in free form and also bo
Modalities Available for Sterilization The most accepted methods of sterilization can be classified as follows: Physical Agents: These comprise of: Sunlight Drying
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bird without syrinx
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Living beings are made of organic and inorganic substances. According to the complexity of their molecules how can each of those substances be classified? Inorganic substances
Pulmonary Function Test: Pulmonary functions tests (PFTs) provide information about a clients manifestation by measuring lung volumes, lung mechanics, and diffusion capabili
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