Which of the following atoms contains the same number of neutrons as an atom of calcium-40? (2 points) select one: a. potassium-40 b. scandium-44 c. argon-38 d. chlorine-36

First, let's find the number of neutrons in Calcium-40. to find the number of neutrons, you need to take the atomic mass minus atomic number

neutrons in Calcium---> 40 - 20 (atomic number) = 20 neutrons

potassium-40---> 40- 19= 21
scandium-44> 44- 21= 23
argon-38> 38- 18= 20
chlorine-36> 36- 17= 19

the answer is argon-38