These elements belong to lanthanoids and actinoids. They have different properties from the elements in main table. So they are placed separately.
On the left side (the first 12 columns + the bottom four in the 13th column+the bottom two in the 14th column+the bottom one in the 15th column)
Cs2S is Caesium sulphide. Separately 'Cs' (Caesium) is found in Group 1. and 'S' (sulphur) is found in Group 6. As a molecule Cs2S is NOT in the periopdic table, only elements are found in ther periodic table. Cs2S means that there are two(2) caesium atoms combined to one(1) sulphur atom.
The 38 elements in groups 3 through 12 of the periodic table are the transition metals.
Air is one of the classical elements, but not an element on the periodic table. The air we breathe is a compound composed of many gases that are in the periodic table separately.
Lanthanides and Actinides are placed separately as the properties of these elements is quite different from the elements in periodic table.
because they are man made.
The are the lanthanoids and actinoids elements.
elements 56 through 71 are called the lanthanoids
They are lanthanides and actinides. They have different chemical properties , hence they are placed separately.
yes
These elements are termed as 'lanthanides' and 'actinides' have certain different characteristics that cannot be fitted into modern periodic table,hence they are placed at the bottom.
The largest atoms on the periodic table are the heavier alkali metals.
at the bottom of tne first group.
some elements in the bottom of the periodic table man has not encountered yet, some are just theories or found on over planets or in space
On the left side (the first 12 columns + the bottom four in the 13th column+the bottom two in the 14th column+the bottom one in the 15th column)
there are more electrons in the elements on the bottom of the table.
The atomic no. of Lawrencium is 103 and it is an actinide and is placed separately from the periodic table.