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

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 ...

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).