Same number of valence electrons cause same properties. The elements with same properties are grouped together. For example- the alkali metals are placed in group-1
elements are in the same group since they react similarly to other elements in that group.
There is a total of 17 elements in those groups.
main group elements
No. noble gases are group VIIIA or group 18 elements
Group 17 elements are called the halogens. Group 18 elements are called the noble gases.
Group 17 elements are called the halogens. Group 18 elements are called the noble gases.
Elements in the second group of the periodic table, also known as Group 2 or the alkaline earth metals, will have 2 electrons in their outer shell. This gives them a full s subshell and makes them relatively reactive.
The oxidation numbers for the first 20 elements in the periodic table are typically as follows: Group 1 elements: +1; Group 2 elements: +2; Group 13 elements: +3; Group 14 elements: +4 or -4; Group 15 elements: -3; Group 16 elements: -2; Group 17 elements: -1; Group 18 elements: 0. Keep in mind that oxidation numbers can vary in different compounds and contexts.
group 2 elements are alkaline elements.one of the element in d group is berrylium
Causes: very low ionization potential, very great electropositivity.
Group one elements are the alkali metals.
Group IA or group 1 elements are known as alkali metals.