What is the number of protons, neutrons, and electrons in #""_18^40Ar#?

1 Answer
Nam D.
Mar 26, 2018

#18# protons, #18# electrons, and #22# neutrons.

Explanation:

In the form of an element, #""_Z^YX#, #Z# is the number of protons, and also the number of electrons, and #Y# is the atomic mass.

So, in the case of #""_18^40Ar#, then it has #18# protons and #18# electrons.

The number of neutrons is given by subtracting the atomic mass from the proton number. So here, #Y=40#, and the number of neutrons is:

#Y-Z#

#=40-18#

#=22#

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