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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.
Tasks of Orientation Phase: Establishing contact with the patient Developing the pactlcontract Talking to the patient Establishing Contact with the Patient
Do octopus and squids have exoskeleton? Octopus and squids normally do not produce external shell (some squid species can have an internal shell). One cephalopod group, the nau
Biota of Littoral Zone This zone is the shore region of the marine ecosystems and is subject to violence of waves and tides, fluctuation of water level and variability of temp
Q. Write the meaning of Polydypsia? Increased Thirst (Polydypsia): As the patient is losing more water through excessive urination, the patient feels thirstier and tends to tak
briefly describe eggs and follicles
What would happen to a cell and its offspring if the cells did not go by a G1 phase during their cell cycle? Describe Without a G1 growth phase, the cells would not grow to th
Does the trend of the change in shape of the graph as temperature increases differ when a different gas is examined?
Define Promoting food security to control under nutrition? Public distribution of food grains through a network of ration shops, particularly to reach the population below the
Name the two groups of nephrons on the basis of their position in the kidney. How are they different from each other? a) How is the halophyte Rhizophora adapted to survive in i
EYE HISTOR Y - Steva n described it first. Study of eye is ophthalmology. Instrument used to examine interior of eye is ophthalmoscop e . SHAP E - More o
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