0
Two electrons in helium are placed in only one shell while three electrons in lithium occupy two shells?
Wiki User
∙ 13y ago
It is because the two electrons in helium are placed in K-shell. The K-shell has the capacity of only two electrons. Therefore, in Lithium the third electron is placed in the L-shell.
You can find the capacity of a shell to hold electrons by the formula 2n2 where n is the shell no.
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
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.
Why does helium and hydrogen does not come in agroup of periodic table?
Helium has 2 valence electrons and hydrogen has 1 electron. So, they are placed in different groups.
What is the maximum number of electrons that can be placed in a Lewis dot diagram?
Eight, except for helium, which has a maximum of two.
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.
Why is helium on the right side instead of being next to helium?
Because it's a noble gas like all the ones under it it doesn't need any valence electrons its a stable element
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.
Why does helium and hydrogen does not come in agroup of periodic table?
Helium has 2 valence electrons and hydrogen has 1 electron. So, they are placed in different groups.
What is the maximum number of electrons that can be placed in a Lewis dot diagram?
Eight, except for helium, which has a maximum of two.
How many electrons are in a neutral atom lithium?
Three. Since the atom is neutral the number of protons and electrons will be equivalent. Lithium is atomic number 3 indicating there are 3 protons in the element, hence three electrons.
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 is the electron configuration for the ion Li?
The element Lithium has a total of three electrons. The first two electrons would be placed in the 1s orbital. Then the third electron would be placed above the first two, in the 2s orbital. Because Lithium Ion has a +1 charge, one electron would be missing. So only the 1s orbital would be full.
Is helium an ion?
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 on the right side instead of being next to helium?
Because it's a noble gas like all the ones under it it doesn't need any valence electrons its a stable element
How come helium has only 2 electrons and is a member of the noble gas?
a noble gas has a full outer shell; in the case of helium the 1s shell is full making it stable and dose not want anymore electrons making it have a low reativity just like the rest of the noble gases
Why can helium be placed in group II?
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.
What element is to be more reactive lithium or neon?
Lithium by far, it is an alkali metal. Alkali metals are known to explode when they are placed in water (hydrogen gas is released). Nitrogen has two electrons to fill, and alkali metals have one electron to give off. Think of it as 2>1. Just know that lithium is more reactive than nitrogen.
What is the highest sublevel electrons in the element Promethium an f block element occupy?
The highest sublevel that Promethium can have is 4f. It is possible for 14 electrons to be placed around Promethium, since the elements in this sublevel each have 7 orbitals.
