Yes
No. It has one electron which is readily lost to produce the Na+ ion. Note - the ONLY elements with a complete outer shell are the noble gasses.
Calcium has a full 4s sublevel, but does not have a full "outer shell", per se, because it is not a noble gas.
no it only has 1 electron in the outer shell
Sodium has ONE valence electron in its outer shell that is to be donated to any kind of oxidant. By then the outer (3rd) shell (of the Na+ ion) is EMPTY, so the 2nd shell has become the outmost, containing 8 electrons (Ne-configuration). No electrons at all are taken up by sodium.
The outer shell of nickel is not full. Nickel has an electron configuration of 4s2 3d8, so its outer shell has two electrons which is not the maximum it can hold (which would be 8).
Beryllium has 2 outer shell electrons. Its full electronic configuration is:- 1s2, 2s2
Noble gases or the inert gases as they are become know as have a full outer shell. It is possible to get different elements to fill in the last outer shell but it is extremely difficult to take electrons from a noble gas therefore when you ask what the difference is the question is perhaps not phrased properly because there is no difference they are two different categories. A noble gas is an element with a full outer shell and full outer shell is when an element has filled all of the max electrons in the last orbital.
Sodium does not have a full outer valence shell. It has one electron in its outermost shell, which makes it very reactive and likely to lose that electron to achieve stability.
The key to "happiness" for an atom is a full outer electron shell. (The outer electron shell is called the valence shell.) There are two conditions that cause a shell not to be full. Either it has only an electron or two (or three) in the outer electron shell or it's short an electron or two in that outer shell. The direct answer to the question is that if an element is chemically active, its outer electron shell is incomplete or is not full.
Yes, noble gases have a full outer shell of electrons, which makes them highly stable and unreactive with other elements. This full outer shell configuration is why they are commonly referred to as inert gases.
Every noble gas does have an outer shell. That's why they don't want to react with any other element. This is because they don't want to gain or lose any electrons. Because they have a full outer shell.
Electron outer shell tee hee =^-^=