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is the octate rule was not succesfull?
it was unsuccessful.
OCTET RULE
The arrangement of the chemical elements in the PERIODIC TABLE is explained by the way in which electrons fill the available energy levels, or shells, in atoms. In particular, the noble gases, such as neon, xenon and argon, have eight electrons in their outermost shell, which is why they do not easily engage in chemical reactions. According to octet rule atoms gain, lose or change valence electrons in order to end up with eight valence electrons. The effect that this has is of providing the same stable electron arrangement as found in inert gases. This rule explains how atoms form ions. Take sodium as an example, it has 11 electrons 2 in the innermost shell 8 in the next and 1 in the outermost shell. The outermost electron is easy to remove so that when energy is added to the sodium atom a sodium ion with one positive charge is easily formed. It takes ten times as much energy to remove an electron from an inner shell, however so a sodium ion with a double positive charge is rarely seen. In the same way calcium an atom with 2 electrons in its outermost shell and 8 in the next lower one forms an ion by losing two electrons. Thus when atoms become ions, they tend to resemble noble gas atoms.
yes the octet rule was successful because it could explain almost all the compoiunds at that time and exceptions do exist...
like if answer is good...
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