2006-12-03 05:26:15 · 7 answers · asked by shan_997 2 in Science & Mathematics ➔ Physics
Helium is like a noble gas in that it has all thelectrons needed to fill it's outer energy field. But unlike other noble gases, it only needs 2 electrons because the first row on the periodic table only contains 2 elements: Hydrogen and Helium.
So 2.
2006-12-03 05:31:48 · answer #1 · answered by cocoxnznz 2 · 1⤊ 0⤋
2
2006-12-03 13:30:57 · answer #2 · answered by T 3 · 0⤊ 0⤋
2
2006-12-03 13:28:57 · answer #3 · answered by Anonymous · 0⤊ 0⤋
2
2006-12-03 13:28:36 · answer #4 · answered by Rachael F 3 · 0⤊ 0⤋
Two.
The outer shell of helium has two electrons and is full since K is full with 2 electrons.
The other noble gases have 8 electrons on their outer shell and are also full and inert like helium
2006-12-03 13:31:49 · answer #5 · answered by maussy 7 · 0⤊ 0⤋
It has 2 valence electron because valence electrons are the number electrons on the outermost orbit of the atom.
2006-12-03 13:32:58 · answer #6 · answered by master123 1 · 0⤊ 0⤋
valence electrons can be known from the group number of the element
helium is in group 2 so it has 2 valence electrons
2006-12-03 13:28:41 · answer #7 · answered by Pharmalolli 5 · 0⤊ 0⤋