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.
Phosphorus has 5 valence electrons.
By looking at the group number you can tell how many valance electrons there are ex: Group 1= 1 valance electrons Group 2-12= 2 valance electrons Group 13= 3 valance electrons Group 14= 4 valance electrons Group 15= 5 valance electrons Group 16= 6 valance electrons Group 17= 7 valance electrons Group 18= 8 valance electrons
6 Use the periodic table as a guide. As you go across from left to right the number of valence electrons increases. H = 1 Be = 2 B = 3 C = 4 N = 5 O = 6 F = 7 This trend stays the same all the way down each column. Usually periodic tables are marked on the top with roman numerals or something to signify how many valence electrons each element has.
Valance electrons means that the element has not reached the octet configuration and is therefore reactive the reactivity depends on the no. of valance electrons the more valance electrons the more unstable the atom is and the more reactive it is.The gasses like helium neon xenon are all inert which means they have an octet configuration and have no delocalised or valance electrons.
it has 2 electrons i think you can tell by subtracting both numbers together
Helium has two valence electrons
none its innert Being inert does not mean you don't have valence electrons. Helium has two valence electrons, both in a 1s orbital.
There are two electrons in the valance shell of helium. Since this is the first shell, it is filled by two electrons.
There are 27 valance electrons.
2 valance electrons
Iodine has 7 valance electrons
because it only has one orbital
They have different numbers of valance electrons
6 valence electrons
6 valence electrons
Helium has 2 electrons.
there are six