Electron Distribution of Atoms - K, L, M aur N Shells kya hote hain?

Write down the electron distribution of chlorine atom. How many electrons are there in the L-shell ? Atomic number of chlorine is = 17.

Write the distribution of electrons in an atom of element whose atomic number is 18. What is special about the outermost electron shell (or valence shell) of the atom of this element ?

An element has an atomic number 12. How may electrons will be present in the K, L and M energy shells of its atom ?