The number of electrons in 19K40 is –
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The notation
19
40
K
19
40
K refers to potassium (K) with an atomic number of 19 and a mass number of 40. The atomic number indicates the number of protons, which is also equal to the number of electrons in a neutral atom.
Therefore, the number of electrons in
19
40
K
19
40
K is 19.