➫➞ 1s2 2s2 2p6 3s2 3p3 periodic. Smallest thing in the world to the biggest in the universe. Final Countdown notes. Тесс зеленый чай.
1s2 2s2 2p6 3s2 3p3 periodic. Smallest thing in the world to the biggest in the universe. Final Countdown notes. Тесс зеленый чай.