Question

name an element in which all the shells are completely filled with electron ​

Answer 1

Answer:

$\bold\red{ Noble \: gases }$

Noble gases are the gases which have completely filled shells or orbitals. For example, atomic number of neon is 10 and its electronic distribution is 2, 8. That means it has two shells which are completely filled. Atomic number of magnesium is 12 and its electronic distribution is 2, 8, 2.