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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.
Various ways/techniques suggested for control of water pollution are as follows: 1. Pollutants (radio active, chemical, biological) present in water bodies can be removed by app
Which are the groups of living beings that form the protist kingdom? The protist kingdom contains protozoans and algae. (Two groups of fungi with same characteristics to protoz
Describe how the structure of chromatin and chromosomes facilitates the following functions: a) DNA packaging. b) Regulation of gene expression. c) Replication at the
Salmonellosis in poultry A wide variety of serovars are prevalent among chicken, turkeys, ducks and geese. The poultry is an important reservoir of salmonellae. The common dise
What are the predicted cell morphology, cell arrangement and gram stain results for each of the follow? 1. Bacillus megaterium 2. Staphylococcus aureus 3. Serratia marcesc
Define National Programmes Targeting Children and Adolescents? Two programmes specially target children and adolescents as a vulnerable group. These are: a) Mid Day Meal Pro
what is class sarcodina
A true-breeding petunia plant with red petals was crossed with another true-breeding petunia plant with white petals. The plants of the F1 progeny had blue petals. When these F1 pl
what is the scientific name of ameoba
Q. What do you mean by Echinodermata? You will recall that Pliylum Echinodermata includes spiny skinned animals which are exclusively marine (Gr, echinus : spiny; derma: ski
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