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In potassium, the 19th electron enter in...

In potassium, the 19th electron enter into 4s subshells instead of 3d subshells.

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This is because energy of 4s subshell is lower than that of 3d subshell.
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  2. Out of 4s and 3d, which subshell is filled first and why?

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  12. Give the electron dot structure of the following compounds : SO2 ,...

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  13. Give the electron dot structure of the following compounds : SO2 ,...

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  15. Justify that the following reactions are redox reactions : 2K(s)+F(2...

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