Electron Distribution in Shells

Find electrons from atomic number, fill K with maximum 2, fill L with maximum 8, then place remaining electrons in the next shell.

Draw concentric shells around the nucleus and place electrons as dots: K first, then L, then M.

Writing chlorine as 2, 7, 8 is wrong because inner shells must be filled before outer shells.

Electron distribution in shells means arranging electrons in fixed shells around the nucleus according to their maximum capacity and filling order.

Electron distribution in shells means arranging electrons in fixed shells around the nucleus according to their maximum capacity and filling order. Maximum electrons in a shell = 2n²; K = 2, L = 8, M = 18 by capacity. Magnesium has 12 electrons, so its distribution is 2, 8, 2.

In the Bohr-Bury scheme, shells are filled from inner to outer levels. The maximum number of electrons in a shell is given by 2n², where n is the shell number. K shell can hold 2, L shell can hold 8, and M shell can hold 18, but for the first 20 elements, students usually fill as 2, 8, 8 before moving further. Maximum electrons in a shell = 2n²; K = 2, L = 8, M = 18 by capacity. For chlorine, Z = 17, so electrons = 17. Fill K with 2, L with 8, and remaining 7 in M. Distribution is 2, 8, 7. Asked as writing distribution from atomic number, identifying valence electrons, or drawing Bohr diagrams. Writing chlorine as 2, 7, 8 is wrong because inner shells must be filled before outer shells.