you need to refer to your textbook, or inquire this to a tutor.
Elements in the same row, or period, of the periodic table fill up the same energy level as you move from left to right. This is because elements in the same period have the same number of electron shells.
Magnesium has three electron shells. The electron configuration is 2,8,2
Sodium, i believe has 3 shells.
Bromine has 4 electron shells.
Polonium has 6 electron shells.
Samarium has six electron shells.
Nickel has 3 (three) electron shells.
Chromium has two electrons in the outer most shell.
Argon and krypton are noble gases, which have full outer electron shells and exist as monoatomic molecules because they are chemically stable and do not form bonds with other atoms easily. This stability is due to their electron configuration, which makes them content with existing as individual atoms rather than forming bonds with other atoms to complete their electron shells.
A sulfur atom has 3 electron shells.
No, iodine has four electron shells, marked as "K", "L", "M", and "N". The number of electron shells is determined by the electron configuration of an element.
Uranium has 92 electrons, which means it has 7 electron shells.