Symbol: A one or two-letter abbreviation used to represent the element. Atomic number: The number of protons in the nucleus of an atom of the element. These rules help in identifying and writing ...

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 ...

This is the chemical symbol for chlorine, written with its mass number and atomic number. Calculate the number of protons, neutrons and electrons an atom of chlorine contains. Number of protons ...