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Why does helium belongs to group 8 while it has 2 electrons in its outer shell?
Wiki User
∙ 11y ago
Helium belongs to group 18 elements along with other noble gases.
All noble gases except helium have completely filled s and p orbitals.
Helium has completely filled 1s orbitals and hence is kept along with the noble gases.
Wiki User
∙ 11y ago
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What does the group of the periodic have to do with reactivity?
The table was organized so that elements of similar properties are in the same group. What (partly) determines reactivity is the number of electrons an atom has in it's ground state. . Within the atom electrons are organized in shells. Atoms are stable when they have 8 electrons in their outer shell (for hydrogen and helium it is 2 electrons.) . Elements of: Group 18 have 8 electrons in their outer shells Group 17 have 7 electrons in their outer shells Group 16 have 6 electrons in their outer shells Group 15 have 5 electrons in their outer shells Group 14 have 4 electrons in their outer shells Group 13 have 3 electrons in their outer shells Groups 3-12 have varied number of electrons in their outer shells Group 2 have 2 electrons in their outer shells Group 1 have 1 electron in their outer shells
How many electrons do the elements of the most stable group have in their outer layer?
Eight, except for helium which has two.
How many electrons does He and Ca have in its outer shell?
Helium (He) has 2 electrons in its outer shell. Calcium (Ca) has 2 electrons in its inner shell and 8 electrons in its outer shell.
What is the atomic number of helium's outer shell?
The outer shell of helium does not have an atomic number, that number belongs to helium itself whose atomic number is 2.
Why is helium placed in group 8 if it has two valence electrons?
Since 2 electrons fills it's outer shell it is considered an inert gas.
What does the group of the periodic have to do with reactivity?
The table was organized so that elements of similar properties are in the same group. What (partly) determines reactivity is the number of electrons an atom has in it's ground state. . Within the atom electrons are organized in shells. Atoms are stable when they have 8 electrons in their outer shell (for hydrogen and helium it is 2 electrons.) . Elements of: Group 18 have 8 electrons in their outer shells Group 17 have 7 electrons in their outer shells Group 16 have 6 electrons in their outer shells Group 15 have 5 electrons in their outer shells Group 14 have 4 electrons in their outer shells Group 13 have 3 electrons in their outer shells Groups 3-12 have varied number of electrons in their outer shells Group 2 have 2 electrons in their outer shells Group 1 have 1 electron in their outer shells
How many outer electrons does sodium have?
1 electron which makes it belongs to group 1
How many electrons do the elements of the most stable group have in their outer layer?
Eight, except for helium which has two.
How many electrons are in the outer shell of helium?
2 valence electrons for helium (helium has only 1 shell)
How many electrons does He and Ca have in its outer shell?
Helium (He) has 2 electrons in its outer shell. Calcium (Ca) has 2 electrons in its inner shell and 8 electrons in its outer shell.
How many electrons do the elements of the most stable group have in their outer shells?
Most of the noble gases have 8 electrons in their outer shell, but helium has only 2, and is the most stable of all elements.
What is the atomic number of helium's outer shell?
The outer shell of helium does not have an atomic number, that number belongs to helium itself whose atomic number is 2.
Why is helium placed in group 8 if it has two valence electrons?
Since 2 electrons fills it's outer shell it is considered an inert gas.
Which group has a stable number of electrons in their outer most energy level?
All the noble gases Helium, Neon, Argon, Krypton, Xenon and Radon have a stable octet of electrons in their outer energy level.
Why is neon in the same group as helium in the periodic table?
Neon and hydrogen are not in the same group in the periodic table. Perhaps you meant neon and helium, which are in the same group. ------------------------------------- And if you did mean Helium and not Hydrogen, then Helium and Neon are in the same group because the group they are in are all elements with "full" electron shells.
How many electrons does helium has in its outer shell?
2
How many valence electrons are in the outer shell of helium?
2 valence electrons
