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​ The number of electrons plus neutrons in 19^40 K^+ is (a) 38 (b) 59 (c) 39 (d) 40 ​

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The number of electrons plus neutrons in \(^{40}_{19}K^+\) is

(a) 38

(b) 59

(c) 39

(d) 40

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1 Answer

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Answer is : (c) 39

For, \(^{40}_{19}K^+\)

Number of electrons in K+ = 18

Number of neutrons in K+ = 40-19 = 21

⇒ Sum of electron + neutron = 18+21 = 39

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