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Atomic Structure and Theory [6A.S]:Question 6
An atom of potassium has 19 protons, 18 electrons, and 21
neutrons. What is the mass of this atom? (only put in the
number, don't worry about the units)
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Respuesta :

We need to find mass number

[tex]\\ \sf\longmapsto Mass\:Number=No\:of\:protons+No\:of\:Neutrons[/tex]

[tex]\\ \sf\longmapsto Mass\:Number=19+21=40[/tex]

Your answer is 40u

Answer:

40

Explanation:

Atomic mass = no. of proton + no. of electron

                      = 19 + 21

                       = 40

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