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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.
Standards of Psychiatric Nursing: By 1956, the Masters programme was extended to two academic years. Some nurses established private practices with psychiatric patients. It
hmp shunt introduction types significant
Q. What is the relation between fecundation and the end of the meiotic process during oogenesis? The oocyte II only completes the second meiotic division (interrupted at metaph
Define Key Concepts and Facts of Polysaccharides? 1. All polysaccharides contain several monosaccharide units. 2. All monosaccharide units are joined to each other by glycosidi
porifera characteristics
Kinds of Hermaphroditism Depending upon the timing of maturity of the gonads, hermaphroditism can be of two types 1. Simultaneous hermaphroditism . Both male and female g
Eukaryotic cells have nucleus delimited by two juxtaposed membranes that start with the membrane of the endoplasmic reticulum. The nuclear membrane, or karyotheca, represents pores
Tr aumatic reticuloperitonitis (TRP) It is also known as traumatic gastritis, hardware disease or traumatic reticulitis. Et i o l o g y : Frequentl
Explain the Toxicity of nicotinic acid? Although therapeutically useful in lowering serum cholesterol, administration of chronic high oral doses of nicotinic acid can lead to h
After the pollination how does fecundation occur in angiosperms? In these plants is fecundation dependent on water? After the pollination one of the sperm nuclei from the polle
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