In the notation of the periodic table, the main shells of electrons are labeled: K (n = 1), L (n = 2), M (n = 3), etc. based on the principal quantum number.
Dalam notasi tabel periodik, kelopak elektron utama diberi label: K (n = 1), L (n = 2), M (n = 3), etc. berdasarkan bilangan kuantum utama.