according to the periodic table, how many neutrons are in a potassium atom that has an atomic mass of…

Explanation:

Step1: Find potassium's atomic number

Potassium (K) has an atomic number of 19 on the periodic table. The atomic number is equal to the number of protons.

Step2: Use the atomic - mass formula

The formula for atomic mass is $Atomic\ mass=Number\ of\ protons + Number\ of\ neutrons$. We know the atomic mass is 41 and the number of protons is 19. Let the number of neutrons be $n$. Then $41 = 19 + n$.

Step3: Solve for the number of neutrons

We can solve the equation $41=19 + n$ for $n$ by subtracting 19 from both sides: $n=41 - 19$. $n = 22$

Answer:

C. 22