E- and Valence Shells [ENDORSED]

[Andrea_Perez_2F]

During lecture it was mentioned that adding an electron to a filled valence shell is unfavorable. Why is it? Is it because energy is required?

[katrinahuwang_1L]

I think that adding an electron to a filled valence shell (such as the noble gas elements) is unfavorable because it is already at its most stable state. When an atom has a full octet, it is the most stable. It doesn't need or want another electron.

[Hudson2J]

A filled valence shell is in the most stable state possible. Adding an electron means adding another shell, which requires a lot of energy because the atom wants to be in a stable configuration. This is why the noble gases don't often bond with other elements, they are stable as is.

[Serene Liu 3H]

A full valence shell is ideal because it is the most stable state, so when you add another electron it makes the ion very unstable since it wants to get rid of the extra electron on the new shell.

[Mia Orr 3B]

Adding an electron to an atom with an already filled valence shell is unfavorable because the atom is already in its most stable state with a full electron shell. Adding another electron means adding a new shell, which makes the atom unstable, so it would want to get rid of the extra electron so it can return back to its most stable state.

[Minoo Bastani 2J]

Adding an electron to a filled valence shell will make an element that is already in its most stable state become more unstable, and atoms in nature are always looking to exist in their most stable state, which is why it does not want to take that additional electron.

[Shannon Lau 14B - 1H]

Like most of my peers said, when the outer most shell is filled, the atom is at its most stable state and when they aren't that is usually where bonds occur where the atoms share the electrons in order to support each other to be its most stable state. Sometimes if they have one or two extra, they can release/give it away and become positive but is still stable or they could take one to fill it. After that is done, there really isn't a point to gain another electron as it would not help the stability.

[Jacob Bright 1C]

Adding an e- to an already filled valence shell is unfavorable because the atom has already fulfilled the 'octet rule', meaning it already has a full octet of electrons and is currently in its most stable possible state, meaning it is generally not highly reactive because it does not seek to gain or lose electrons. The addition of an another electron means the atom no longer has this stability, and as such it is not favored to transition an atom from a stable to an unstable state.

[Anish_Marripati_2F]

It's unfavorable because it has already satisfied the octet rule and it's in the most stable state. If an atom is already in a stable state, there is no reason for it to accept another electron.

[Shreya Arcot 3K]

The valence shell of an atom is the most stable when it has 8 valence electrons, following the octet rule. Adding (or removing) electrons to the atom disrupts this stability, which is why it is unfavorable.

[Arjun_Anumula_3E]

Adding an electron to a filled valence shell would cause for the energy of the molecule to increase as the electron would have to occupy a new shell. This is why noble gases often do not react in nature due to the fact that they are very stable and electrons neither want to leave or join.

[Hailey Sarmiento 3E]

A full valence shell is already a desirable and stable state so adding another electron would require having to absorb a lot of energy and would lead to an unstable atom.

[Madison Rhynhart 3H]

If the element is at an octet or has a full set of 8 valence electrons, then adding an extra electron would be unfavorable as it would create an unpaired set that would be more likely to bond or be lost to other molecules.

[Veronica Larson- 1I]

If the element already has a filled valence shell, it is at its most stable state, so adding another electron would not be favorable because you would have to start filling another shell, which would make it less stable.

[Caitlyn Lo 2F]

Adding an electron to an already filled electron shell would be unfavorable because the atom is already at its most stable state. There is no need to add an electron if the outer electron shell is filled and doing so would be unfavorable.

[Madison Nguyen 3L]

If an electron is added to an already filled valence shell, then it is unfavorable because an electron cannot be added to an atoms that already has a full octet, and thus, is at its most stable state.

[Maggie Clark]

This depends on the element because elements that have full valence shells (noble gases) because in this case the element doesn't want any more electrons.