Each element will be described in this order: atomic number name symbol whether it is a metal, metalloid, or nonmetal whether it is a solid, liquid, or gas and atomic mass. It is labeled “Symbol.” Below that is the number 1.008 which is labeled “Atomic Mass.” Below that is the word hydrogen which is labeled “name.” The color of the box indicates that it is a nonmetal. The number 1 is in its upper-left hand corner and is labeled “Atomic number.” The letter “H” is in the middle in red indicating that it is a gas. To the left of this box is an enlarged picture of the upper-left most box on the table. The 18 columns are labeled “Group” and the 7 rows are labeled “Period.” Below the table to the right is a box labeled “Color Code” with different colors for metals, metalloids, and nonmetals, as well as solids, liquids, and gases. doi: 10.1515/ract-2018-3082.\): Elements in the periodic table are organized according to their properties. "Evolution of the periodic table through the synthesis of new elements". Archived from the original on 30 January 2021. "The positions of lanthanum (actinium) and lutetium (lawrencium) in the periodic table: an update".
Quantum Mechanics: Non-Relativistic Theory. "The Positions of Lanthanum (Actinium) and Lutetium (Lawrencium) in the Periodic Table". Archived (PDF) from the original on 13 April 2021. "Provisional Report on Discussions on Group 3 of the Periodic Table" (PDF).
Archived (PDF) from the original on 25 March 2012. "New Notations in the Periodic Table" (PDF). Later (1902), Mendeleev accepted the evidence for their existence, and they could be placed in a new "group 0", consistently and without breaking the periodic table principle. See also Group 3 element#Composition.ĭ Group 18, the noble gases, were not discovered at the time of Mendeleev's original table. Some sources follow a compromise that puts La–Lu and Ac–Lr as the f-block rows (despite that giving 15 f-block elements in each row, which contradicts quantum mechanics), leaving the heavier members of group 3 ambiguous. Arguments can still occasionally be encountered in the contemporary literature purporting to defend it, but most authors consider them logically inconsistent. General inorganic chemistry texts often put scandium (Sc), yttrium (Y), lanthanum (La), and actinium (Ac) in group 3, so that Ce–Lu and Th–Lr become the f-block between groups 3 and 4 this was based on incorrectly measured electron configurations from history, and Lev Landau and Evgeny Lifshitz already considered it incorrect in 1948. This makes the group somewhat exceptional.ī The 14 f-block groups (columns) do not have a group number.Ĭ The correct composition of group 3 is scandium (Sc), yttrium (Y), lutetium (Lu), and lawrencium (Lr), as shown here: this is endorsed by 19 IUPAC reports on the question. Hydrogen is not considered to be an alkali metal as it is not a metal, though it is more analogous to them than any other group. Elements of the group have one s-electron in the outer electron shell. A Group 1 is composed of hydrogen (H) and the alkali metals.