Long-term cocaine use can lead to heart arrhythmia and heart attacks, strokes, seizures, headaches, abdominal pain, ulcers, nausea, and sometimes death. Long-term use can also affect the kidneys. Users may also experience extreme weight loss. These effects can happen regardless of age or health.
atomic number. The number of protons in the nucleus of an atom. In electrically neutral atoms, this number is also equal to the number of electrons orbiting about the atom's nucleus. The atomic number of an element determines its position in the Periodic Table.
It is conventionally represented by the symbol Z. The atomic number uniquely identifies a chemical element. In an uncharged atom, the atomic number is also equal to the number of electrons. The atomic number, Z, should not be confused with the mass number, A, which is the number of nucleons, the total number of protons and neutrons in the nucleus of an atom.