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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.
SELF - MEDICATION - Self medication refers to the use of medicines without consulting a physician. Self medication may be harmful, rather dangerous. It must be avoided. (i)
Q. How different is the simple cuboidal epithelium from the columnar epithelium? Where can these epithelia are found in the human body? The simple cuboidal epithelium is made o
What are the intermediate and the definitive hosts of the plasmodium? In the life cycle of the plasmodium humans are the middle hosts (where asexual reproduction takes place) a
Explain about the Importance of Vitamins? Vitamins are the organic substances that act as coenzyme and/or regulator of metabolic processes. There are 13 known vitamins, most of
characteristics of class mamalias
Cannulation : Typically blood is drained by gravity through two cannulae inserted into the superior and inferior vena cavae. During bypass, if the SVC and IVC are snared, the ent
what is gene library
To test the gas given off when seeds germinate Place some mustard seeds in a flask with some damp cotton wool, in the apparatus shown in the diagram, and permit them to germina
A healthy potted pitcher plant when kept in a green house with favourable conditions of light, temperature, soil and water showed poor growth although there was no infection. Give
Describe giving one example of each, the three types of joints in human skeleton, based on the capacity of movement. A patient was complaining of frequent urination, excessive
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