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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.
You are interested in using formic acid (pKa = 3.75) as a buffer for your biochemical Experiment. a) Would it be most useful for creating a buffered solution at pH 2, 4 or 6? Ex
What are the physiological systems known as integrative systems? Why is this designation justified? The integrative systems are the nervous system and the endocrine system. The
difference between the respiration occurs in lower and higher organisms
What are the functions of the osseous tissue? The major functions of the osseous tissue are: to give structural rigidity to the body and to delineate the spatial positioning of
Helobial Type - Endosperm This type of endosperm is intermediate between the nuclear and the cellular types. The division of the primary endosperm nucleus is followed by the f
Q. What are the analyses provided by the study of human age pyramids? The study of human age pyramids able to provide the following analyses, proportion of individuals at an ec
What is adaptive convergence? The Adaptive convergence is the phenomenon by which living beings facing the same environmental pressure (problems) and undergoing genetic variabi
Whenever a chromosome is replicated the replication machinery passes by the nucleosomes without deleting the histones from the DNA. How this happens is since not fully understood.
how many atoms are H2SO4 compound
What is Asexual Reproduction? Asexual reproduction occurs in prokaryotes through the process of binary fission. Primitive eukaryotes and plants also reproduce by various t
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