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Q. The number of electrons plus neutrons in ${ }_{19}^{40} K ^{+}$is

KVPYKVPY 2012

Solution:

For, ${ }_{19}^{40} K ^{+}$
Number of electrons in $K ^{+}=18$
Number of neutrons in $K ^{+}=40-19=21$
$\Rightarrow$ Sum of electron $+$ neutron
$=18+21=39$