PCP (Phencyclidine) - PCP is a "dissociative" drug, distorting perceptions of sight and sound and producing feelings of detachment. Users can experience several unpleasant psychological effects, with symptoms mimicking schizophrenia (delusions, hallucinations, disordered thinking, extreme anxiety).
How to Write Electron Configurations for Atoms of Any Element
The current measurements indicate that 75% of the mass of the Universe is in the form of hydrogen, 24% in the form of helium and the remaining 1% in the rest of the periodic table (note that your body is made mostly of these `trace' elements). Note that since helium is 4 times the mass of hydrogen, the number of hydrogen atoms is 90% and the number of helium atoms is 9% of the total number of atoms in the Universe.