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One atom of $^{39}_{19} K$ contains :

$(a)\;19 p;\;20n\;and \; 19\;e^-$   $(b)\;19 p;\;20n\;and \; 20\;e^-$   $(c)\;20 p;\;10n\;and \; 20\;e^-$   $(d)\;20 p;\;19n\;and \; 19\;e^-$  
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$(a)\;19 p;\;20n\;and \; 19\;e^-$
answered Nov 7, 2013 by pady_1

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