In one mole, there are 6.022 x 10 23 atoms. Here's another way: there are 6.022 x 10 23 atoms of carbon in 12 grams of carbon-12. Let's say that real clearly: one mole of ANYTHING contains 6.022 x 10 23 entities. The word entities is simply a generic word.
Shadow zone. A seismic shadow zone is an area of the Earth's surface where seismographs cannot detect an earthquake after its seismic waves have passed through the Earth. When an earthquake occurs, seismic waves radiate out spherically from the earthquake's focus.
twilight zone. Twilight zone is the mental state between reality and fantasy, or the lowest level of the ocean that light can penetrate. 1  When you come home and your extremely messy teenager has cleaned the house from top to bottom, this is an example of a time when you might feel you are living in the twilight zone.