In the periodic table, the elements are grouped according to their properties. Elements in a group has an equal number of valence electrons. So the elements in a group have most common chemical properties.
The two most reactive groups of elements in the periodic table are the alkali metals and halogens.
Main group elements have elements from groups 1 and 2, except hydrogen and groups 13 to 18. Main group elements are elements in groups who's lightest elements are shown by helium, lithium, boron, beryllium, carbon, nitrogen, oxygen, and fluorine.
There are 18 groups in the periodic table of elements.
Groups 1 and 17.
groups 11 and 12
In the periodic table, the elements are grouped according to their properties. Elements in a group has an equal number of valence electrons. So the elements in a group have most common chemical properties.
There are three types of elements: metals, metalloids, and nonmetals. Most elements are metals.
The two most reactive groups of elements in the periodic table are the alkali metals and halogens.
metals & non-metals
Groups 3-12 have elements with the most diverse set of properties in the periodic table. They are transition elements.
The noble gases.
Group one has seven known elements, the most of any of the 18 groups on the periodic table so far.
1 and 2
Non metals (groups 17, 16, 15)
Elements located in groups 4 - 12 in the modern periodic table are considered as transition elements. Transition elements should not be confused with the d-block elements which are from groups 3 - 12.
because they have similar properties to the other elements in their groups