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
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Muscle cells are most likely affected by the poison.
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Hippocampus is important for forming long term memories, while the Prefrontal cortex is responsible for memories retrieval.