The colors of rubies and emeralds are so striking that they define shades of red and green – ruby red and emerald green ... which is a type of rock with a consistent chemical composition and a highly ...

Scientists use the periodic table to quickly refer to information about an element, like atomic mass and chemical symbol. The periodic table’s arrangement also allows scientists to discern trends in ...

If the chemical symbol consists of more than one letter, any subsequent letters are lowercase. Example: Hydrogen → H, Helium → He 118 Elements and Their Symbols and Atomic Numbers ...