If an element A=40, n=22, the number of electrons are O 19 17 18. 20
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Its mass number is (A) 37 (B) 17 (C) 38 (D) 22. ... No. of protons = No. of electrons ⇒ No. of protons =18 ⇒ Mass No. =18+20=38 ... The number of electrons in [19K40]−1 is.
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number of neutrons + number of protons = mass number
atomic number = protons
do in this way u will get answer
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