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It would have 20 protons, 20 neutrons, and 20 electrons. Protons and electrons are USUALLY (I say usually because of the different types of atoms) the same as the atomic number. To find neutrons you take the atomic mass minus the atomic number. 40-20=20
Answer:
Your username looks like you headbutted the keyboard and unfortunately, I doubt anyone is going to write three paragraphs for you.
Explanation:
Start here:
https://science.howstuffworks.com/environmental/earth/oceanography/rogue-wave4.htm