core electron

core electron : Core Electrons: the electrons in the inner part of the atom that are not valence electrons and therefore do not participate in bonding. An example is carbon: Carbon has a total of 6 electrons, 4 of which are valence electrons, so the remaining 2 electrons must be core electrons. They are so tightly bound to the nucleus as to be negligibly perturbed by the environment of the atom when in the solid state. Therefore on the contrary of the valence electrons, the core electrons usually play a secondary role on chemical bonding and reactions and their main role is to screen the positive charge of the atomic nucleus. In transition metals, however, the distinction between core and valence electrons is more subtle and it could be very important to consider the electrons in the highest d-shells as valence rather than core electrons. A core electron can be removed from its core-level upon absorption of electromagnetic radiation ( X-ray) and excited to an empty outer shell or emitted..   More from Wikipedia

core electron : An electron is a subatomic particle that carries a negative electric charge. It has no known substructure and is believed to be a point particle. An electron has a mass that is approximately 1836 times less than that of the proton. The intrinsic angular momentum ( spin) of the electron..   More from Wikipedia

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  QUESTION: The decreasing trend in ionization energy going down a group is, is due to... A. Increasing repulsions among electrons in the valence shell B. Increasing effective nuclear charge C. Decreasing number of core electrons D. Increasing size of valence shell ... 2-6-6 Chemistry ionization energy decreasing trend group shielding effect

Question :

Answer : Cobalt has 27 electrons Co2+ has 25 electrons Co2+ = [Ar] 4s2 3d5..   More from Yahoo Answers

Question : they are directly proportional they are inversely proportional they are equal there is no relation

Answer : By core electrons i am assuming you mean the inner electrons, if so, then there is no relationship between them. Group number is only related to the valence electrons. e.g. e.c of Na is 2,8,1 and hence it is in group 1...   More from Yahoo Answers