118 Elements and Their Symbols and Atomic Numbers: The periodic table ... H - Hydrogen He - Helium Li - Lithium Be - Beryllium ...

Precision spectroscopy of helium and other atomic systems is a vital area of research in modern physics, particularly in testing fundamental theories like quantum electrodynamics (QED).

Now, each element has a chemical symbol made of one or ... that follow will be lower case letters, for example, helium is He. Some element symbols are simple. For example, oxygen is O.Others ...