3d-block elements or tranformation elements
and
4f-block elements or lanthanides and actinides
The main group elements are groups 1, 2, and 13-18. Groups 3-12 are the transition metals.
See the link below fot the IUPAC model of the periodic table of elements.
A group (or family) of elements is a column on the Periodic Table. All elements in a group share the same sorts of characteristics. All elements in the same group have the same amount of electrons in their outer shell. Another example of physical characteristics is in Group 1 - Alkali Metals. They are all incredibly reactive in Water.A group (or family) of elements is a column on the Periodic Table. All elements in a group share the same sorts of characteristics. All elements in the same group have the same amount of electrons in their outer shell. Another example of physical characteristics is in Group 1 - Alkali Metals. They are all incredibly reactive in Water.
The Periodic Table has 7 periods (horizontal rows) and 18 groups. The two groups of 14 elements at the bottom (lanthanides and actinides) are parts of the 6th and 7th periods, between groups 2 and 3, but are placed below to limit the displayed width of the table.
There are far to many elements following the 6th on in the Periodic Table. Included below is a link to a very nice Periodic table.
These elements are the lanthanides; see the link below for some details.
Periodic table has 18 groups; see the link below.
The Lanthanides and the Actinides.
The "Periodic Table of the Elements". See related link below.
See the link below fot the IUPAC model of the periodic table of elements.
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.
A group (or family) of elements is a column on the Periodic Table. All elements in a group share the same sorts of characteristics. All elements in the same group have the same amount of electrons in their outer shell. Another example of physical characteristics is in Group 1 - Alkali Metals. They are all incredibly reactive in Water.A group (or family) of elements is a column on the Periodic Table. All elements in a group share the same sorts of characteristics. All elements in the same group have the same amount of electrons in their outer shell. Another example of physical characteristics is in Group 1 - Alkali Metals. They are all incredibly reactive in Water.
The periodic table contain all chemical elements. For the table see the link below.
by their atomic number
See the periodic table at the link below.
The Periodic Table has 7 periods (horizontal rows) and 18 groups. The two groups of 14 elements at the bottom (lanthanides and actinides) are parts of the 6th and 7th periods, between groups 2 and 3, but are placed below to limit the displayed width of the table.
As of January 27, 2008, there are 117 elements, and all of which can be found on the Periodic Table of Elements. See the link below for the Periodic Table of elements.
F-block elements The first row is called lanthanides The second row is called actinides