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Because Helium, as the atom number 2, has only 2 protons in the nucleus, so the element He can 'hold' only 2 electrons in its prime K-orbit.
However they should not be referred as 'valence' electrons, because they don't participate in valency (= capable of bonding):
the K-orbit is stable and filled up and can NEITHER collect more electrons from NOR it will provide its own pair of electrons to other elements thus making it inert
(Helium is a 'nobel' gas)
What else can I help you with?
How many valence electrons does heluim need to have a filled outermost energy level?
Helium only needs two electrons to have a filled outermost energy level.
What is the Valence electron in He?
helium has only one shell with two electrons and can be considered to be as the valence electrons.
How many valance electrons does helium have?
Helium has two valence electrons. It is the only noble gas not to have eight valence electrons. Helium has the electronic configuration 1s2.The Noble gases have eight valence electrons in their outer shell.
How valence electrons does helium have?
Helium has two valence electrons. It is the only noble gas not to have eight valence electrons. Helium has the electronic configuration 1s2.The Noble gases have eight valence electrons in their outer shell.
How many electrons does Ba has?
Valence electrons are electrons that are on the outside "shell." In Group (column) 1, there is only one valence electrons for each element. In Group (column) 2, there are two valence electrons. Group 13: 3 valence electrons Group 14: 4 valence electrons Group 15: 5 valence electrons Group 16: 6 valence electrons Group 17: 7 valence electrons Group 18: 8 valence electrons There is no Group 19, so this list is done. For the metals, each element will need to be mapped out utilizing the Bohr Diagram design or something of the like as valence electrons are difficult to define due to the grouping on the periodic table. The most valence electrons that can be in an outer shell is eight. Barium (Ba) is in Group (column) 2, and thus has only two valence electrons.
What is the number of valence electrons for He?
Two valence electrons.
How many valance electrons does the oxygen have?
six valence electrons.....It only requires two more to complete octet....
How many valence electrons does radon have?
Radon has 8 valence electrons (electrons in it's outer shell) so does Ne, Ar, Kr, Xe. Helium is in the same line, but only has 2 valence electrons. Hope that helps! Sarah G.
How many valence electrons Be have?
Beryllium has two valence electrons.
How many valence electrons does zinc have?
Zinc has two valence electrons.
Do sulfur and magnesium both have two valence electrons?
No, sulfur has six valence electrons, while magnesium has two valence electrons.
What metal has two valence electrons?
Calcium is a metal that has two valence electrons.
