How many neutrons does element x have if it’s atomic number is 40 and it’s mass number is 18

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

as a camel goes without food, its hump begins to shrink. its fur prevents the camel from sweating too much.camels store fat in their humps, not water.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.