Just so it can fit on one page
Partly for convenience, since a "super-wide" form Periodic Table would be too wide to fit on a single normal page. This is also justified chemically, because all of these elements have chemical properties very similar to each other and to other elements in column 3.
Because they are all in group 3 of the periodic table. If they were shown in the periodic table where they belong, the periodic table would need to be shown on two pages and would be more cumbersome to work with.
They possess different properties. So they are kept different in order to not disturb the main table.
Lanthanides and actinides are placed at bottom of periodic table. They possess different chemical properties.
Because their electronic configuration is ended at 'f' orbitals and can not be placed in 's','p' and 'd' blocks.
This is only a conventional system proposed for the aesthetics of the periodic table presentation.
Just so it can fit on one page
these are rare elements
Because their electronic configuration is ended at 'f' orbitals and can not be placed in 's','p' and 'd' blocks.
The periodic table of elements is a chart that organizes the elements and emphasizes their shared traits and commonalities. All the known elements and their atomic number are on the periodic table.
Just for the size of the periodic table; with it in, it would almost double in length.
beacause they are rare metals and they help basketball players
They are silvery metals that conduct electricity
elements 56 through 71 are called the lanthanoids
The elements that are placed outside of the periodic table are called transactinides. These elements are usually placed in a separate row below the main table and are synthetic elements that do not occur naturally on Earth.
Because their electronic configuration is ended at 'f' orbitals and can not be placed in 's','p' and 'd' blocks.
The last two periods are called lanthanoids and actinoids. They have different properties.So, they are placed separately.
- In a modern periodic table (after IUPAC rules) lanthanoids are placed above actinoids. - Before uranium are placed thorium, protactinium, actinium, etc. - After uranium are neptunium, plutonium, americium, curium, etc.
Lanthanoids are placed down in the periodic table.They contain elements with atomic number 57 to 71.There are total 15 elements in lanthanoids group.
Actinoids are placed in a separate row under the periodic table.
The periodic table of elements is a chart that organizes the elements and emphasizes their shared traits and commonalities. All the known elements and their atomic number are on the periodic table.
Lanthanoids are placed in a special row under the periodic table.
Just for the size of the periodic table; with it in, it would almost double in length.
beacause they are rare metals and they help basketball players
They are found below the periodic table because they would take up too much room in the periodic table