How many valence electrons does rubidium have?
Answer:
Rubidium has one valence electron.
To find out the number of valence electrons in a rubidium atom,we need to look at the periodic table.
The position of rubidium in the periodic table is in group IA.For main group elements,valence electrons are equal to the group number.So,rubidium atom has one valence electron in its valence shell or outermost energy level.
Again, rubidium is an element of group 1.Now just consider the unit place digit from group number.You are getting 1 which is equal to the number of valence electrons in rubidium.
Here is the another way to find out the valence electrons of rubidium.
The symbol of rubidium is Rb and the atomic number of rubidium is 37.So,it has thirty seven electrons totally.
Now do the electronic configuration of rubidium.
Rb(37) =1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1
=[Kr] 5s1
[Tip: Complete filled d orbital is not considered as part of valence shell or energy level]
The valence shell is the outermost shell and the electrons that are present in valence shell is called valence electrons.
The valence shell or energy level can be identified by the highest value of principal quantum number,n.Here the highest value of n is 5.So,the valence shell is the 5th shell or energy level.
In 5th shell ,we get one valence electrons.So each rubidium has one valence electron.
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