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What is the number of valence electrons ...

What is the number of valence electrons in the atom of an element A having atomic number 17 ? Name the valence shell of this atom.

Text Solution

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The electronic configuration of element A is
`{:(K,L,M),(2,8,7):}`
Therefore, the M shell is the outermost shell or the valence shell.
Number of valence electrons =number of electrons in the outermost shell=7.
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