use fullscreen for a better view There are 118 elements (that have been discovered) WHAT THEY MEAN Atomic Number: The number of protons in the nucleus (which is the same as the number of electrons in the atom) It also means that for example, Helium was the second element put on the periodic table, as its atomic number is 2. Symbol: A one or two letter symbol that represents the element. These internationally-used symbols are abbreviations for the common name or the Latin name of the element. Name: The name of the element. Chemical Block Group: A group of elements linked by the atomic orbitals whose valence electrons or vacant positions reside. The s-block, p-block, d-block, and f-block are designated after their respective orbitals. Except for helium, the s-block elements are all on the periodic table's left side.
