+2,+3,+4,+5,+6,+7,8
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This theory is given by alfred werner in 1892. The main postulates of this theory are as follows. 1) in the coordination compound the metal show two types of valancies or linkage these are called primary and secondary valancies . 2)the primary valancies are normally ionisable and are represented by the oxidation number and are satisfied by negative ions. 3) the secondary valancies are non - ionisable and are satisfied by neutral moleclues and negative ions. They are represented by coordination number and fixed for an atom. 4) the secondary valancies are directed towards the fixed positions in space . It leads to definite geometrry of the complex compound . On the other hand primary valancies are non-directional.....
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The electronic configuration of technetium is [Kr] 4d^5 5s^2. This means that technetium has 5 electrons in its 4d orbital and 2 electrons in its 5s orbital.
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No. It is quite difficult for elements to change into new elements.
There are a total of 118 elements known to exist on the periodic table.
The current periodic table contains 118 elements, as of April 2010, but many more may still be discovered.
the sum of the elements divided by the number of elements is the average
main group elements
Transuranium Elements
There are 118 elements on the periodic table.