Henry D. Hubbard (1870-1943) was a member of the

U.S. Bureau of Standards The National Institute of Standards and Technology (NIST) is an agency of the United States Department of Commerce whose mission is to promote American innovation and industrial competitiveness. NIST's activities are organized into physical sci ...

in the 1920s. He modernized Mendeleev's periodic table and in 1924 he produced a version of the

Periodic Table of Elements The periodic table, also known as the periodic table of the (chemical) elements, is a rows and columns arrangement of the chemical elements. It is widely used in chemistry, physics, and other sciences, and is generally seen as an Cultural i ...

(called the ''Periodic Chart of the Atoms'') which was distributed to schools and universities. His version of the periodic table placed the main groups in columns with some later groups taking up two rows per period and the Group VIIIB

transition metal In chemistry, a transition metal (or transition element) is a chemical element in the d-block of the periodic table (groups 3 to 12), though the elements of group 12 (and less often group 3) are sometimes excluded. They are the elements that can ...

s displayed out to the right of the noble gases. The noble gases themselves were shown first in Column 1 (Valence 0) and repeated in Column 9 (Group VIII). The table is also notable for including the solo Neutron as an entry on its own, "above" Hydrogen, and given the symbol lower-case 'n'.

Gallery

Hubbard's Periodic Chart of the Atoms NMAH-2007-4685.jpg, Hubbard's Periodic Chart of the Atoms (1963 version) Seaborg in lab - restoration.jpg,

Glenn T. Seaborg Glenn Theodore Seaborg (; April 19, 1912February 25, 1999) was an American chemist whose involvement in the synthesis, discovery and investigation of ten transuranium elements earned him a share of the 1951 Nobel Prize in Chemistry. His work in ...

in his Berkeley Laboratory, in front of a Hubbard periodic table chart (pictured 1950)

References

External links

Video about a 1930s Hubbard Periodic table found in the University of Rio de Janeiro, Brazil
showing discredited elements ₈₇ Virginium, ₆₁ Illinium, ₈₅ Alabamine and ₄₃ Masurium. Year of birth missing Year of death missing People involved with the periodic table United States Department of Commerce officials {{US-gov-bio-stub