What is the purpose of using variables in programming? O To calculate equations
O To define functions
O To print statements
O To store string values

Variables are used to store information to be referenced and manipulated in a computer program. ... It is helpful to think of variables as containers that hold information. Their sole purpose is to label and store data in memory. This data can then be used throughout your program.

I believe you may have flipped which numbers apply where. Since each proton and neutron equal a mass of 1 amu (atomic mass units), the mass cannot be lower than the atomic number.

So if the atomic number is 18, and the atomic mass is 40, that means that the number of neutrons is the difference.

so, you have

each neutron weighs 1 amu so you should have 22 neutrons.

22 Neutrons