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The reason it can be placed in group II is because it has 2 electrons in its outside shell (also its only shell) and the groups represent how many electrons in the elements outside shell, the reason it is normally placed in group 8 or 0 is because the first shell has a maximum of 2 electrons and all elements that have a full outside shell are placed in group 8/0 and can't normally react.

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โˆ™ 2010-02-16 10:39:04
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Q: Why can helium be placed in group II?
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Related questions

Why is helium not placed in second group?

Similar to group 18 elements (or noble gases), helium is chemically inert and it has completely filled orbitals. Hence helium is place along with group 18 elements.


What gas does helium falls in.?

Helium (He) is a noble (inert) gas placed in the group 18 of the Periodic Table.Helium falls in inert gas. It is stable and non-reactive.


Why is helium placed in group vii?

It isn't, it is in group viii and that is due to the full outer shell or 1s orbital.


Why is helium with only two electrons placed in group VIII of the periodic table?

The outer most orbitals of helium and other noble gases have completely filled orbitals. Hence helium is placed along with the other noble gases.


Why is helium's position not justified in periodic table?

Helium has 2 valence electrons and it should theoretically be placed along with group 2 elements. But since helium has completely filled orbitals (as do the noble gases), it is placed along with the noble gases.


What is the symbol for He in the periodic table?

He is the symbol of Helium element. It is placed in group-18 of periodic table.


Helium is placed in group 18 on the periodic table because?

it has a full outer shell of electrons


Why is Helium placed in group 18 on the periodic table?

We all know that helium is a noble gas. It has atomic number 2 but it is placed in 18 group be because in 1st group the elements have only one electron in thier s orbital e.g. Hydrogen, lithium, sodium, potassium etc. But helium has two electron so it cannot exist in 1 group. In second group the s orbital are same but the physical and properties of helium is different from the elements present in second group. According to modern periodic table elements which have same physical properties are placed in same group. Since helium is an inert gas and its physical properties are similar to the other elements of the 18 group and also helium discoverd late so that hilium can be put in the 18 group


Why is neon in the same group of periodic table as helium?

Neon and helium fall under the same column in the periodic table. Both has stable electron shell.


Where is helium placed on the periodic table?

helium is placed on the periodic table with all the otheres :)


Is helium an atom?

Yes helium is an atom. It is stable. It is placed in group 18.Yes, helium is a monoatomic molecule. It is stable itself as it has already achieved maximum possible electrons in its outermost shell. It is the only element in group 18 without 8 electrons in valence shell.


Why is helium in group 18 in the periodic table?

We all know that helium is a noble gas. It has atomic number 2 but it is placed in 18 group be because in 1st group the elements have only one electron in thier s orbital e.g. Hydrogen, lithium, sodium, potassium etc. But helium has two electron so it cannot exist in 1 group. In second group the s orbital are same but the physical and properties of helium is different from the elements present in second group. According to modern Periodic Table elements which have same physical properties are placed in same group. Since helium is an inert gas and its physical properties are similar to the other elements of the 18 group and also helium discoverd late so that hilium can be put in the 18 group

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