they are of two types
lanthanides and actinides
The elements of the 4f series are called lanthanides. They are a group of metallic elements that have similar properties and occupy the f-block of the periodic table.
Europium belongs to the lanthanide family, also known as the rare earth elements. These elements are found in the f-block of the periodic table and share similar chemical properties.
Just for the size of the periodic table; with it in, it would almost double in length.
F-block elements are called inner transition elements because they have partially filled f orbitals, which are part of the inner electron shell. These elements typically have electrons filling the f orbitals after the d orbitals, hence the term "inner transition."
There are 14 orbitals in the f block. This is because each f sublevel can hold a maximum of 7 orbitals, with each orbital being able to hold a maximum of 2 electrons.
they are of two types lanthanides and actinides
The f-block elements in period 7 are known as the actinides.
The Lanthanides consist of the elements in the f-block of period six in the periodic table. While these metals can be considered transition metals, they have properties that set them apart from the rest of the elements.
There are 14 orbitals in the f block. This is because each f sublevel can hold a maximum of 7 orbitals, with each orbital being able to hold a maximum of 2 electrons.
4: the s-block, the p-block, the d-block, and the f-block. there is an theoratical g-block but its not counted because its theoratical lol.
The periodic table is arranged (1) by increasing atomic number; (2) into groups of elements with similar chemical properties; (3) into periods of elements with the same number of electron shells.
Transition elements may be defined as those elements which have partialy filled d and f subshells in atomic state so d and f block elements called transition elements.
D block elements are at the center of the periodic table; f block elements are at the bottom.
inner transistion elements or rare earth elements
The d-block elements have similar periodic properties to main group elements but exhibit greater variability due to the presence of partially filled d-orbitals. Additionally, d-block elements have higher atomic and ionic sizes, higher ionization energies, and form colored compounds compared to main group elements. The d-block elements also show a wider range of oxidation states and complex formation due to their partially filled d-orbitals.
They are F-block elements
Elements can be categorized into four blocks based on the number of electron orbitals: s-block, p-block, d-block, and f-block. Each block corresponds to a different type of orbital in which the electrons are likely to be found.