Question

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)
Enter answer below
Enter your response

Answer 1

40

Step-by-step explanation:

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

= 19 + 21

= 40

Answer 2

We need to find mass number

`\\ \sf\longmapsto Mass\:Number=No\:of\:protons+No\:of\:Neutrons`

`\\ \sf\longmapsto Mass\:Number=19+21=40`

Your answer is 40u