Template:Periodic table (Reihen and periods)/doc

Usage

Short, Long

Short form, Mendeleev, 1871

Long form, introduced ca. 1930
(footnote rectangle was added ca. 1940, Seaborg)

Illustrative images

Monument in Saint Petersburg (1932). The blue elements were added after first publication.

Hubbard's short PT (US Bureau of Standards), (1924–...)

Seaborg in his lab, Hubbard's short PT in the background (1950)

features

• Te - I swap:

see also 1869. Scerri (2007) p109.