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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.
explain satellite chromosomes
Explain Mechanism of Absorption of Haem Iron? Haem iron is soluble in the alkaline environment of the intestine. It binds to the receptor on the enterocytes and is internalized
Diabetic foot are impaired blood supply to foot Diabetic foot are impaired blood supply to foot i.e. vasculopathy. This leads to ischaemia which in turn leads to delayed or non
Open Head Injuries Open head injuries are TBIs in which the skull is penetrated, as in gun shot or missile wounds, or in which fragment of bone penetrate the brain substance. O
Q. What is the function of the antidiuretic hormone? Where it made and which is the stimuli that increase or reduce its secretion? The antidiuretic hormone is secreted by the h
Domestication - Wildlife It means that man has taken under his direct care the living beings which are useful to him. Through extensive breeding programmes, he has modified th
Explain Non-Glycerides in Edible Oils? You may be aware of the fact that the glyceride fraction (an ester of glycerol and fatty acids that occurs naturally as fats and fatty oi
Do phylogenetically proximal species have cells with proximal chromosome counts? The number of chromosomes typical of every species is proximal for phylogenetically proximal sp
REGULATION OF BLOOD GLUCOSE LEVEL Various levels of regulation are exerted at substrate level, hormonal level, enzymatic level and at organ level on carbohydrate metabolism s
Internal Mammary Artery (1MA) : This is an excellent graft. When left internal mammary artery (LIMA) is anastomosed to LAD, which has more than 70 per cent block, patency at
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