8 until you go lower down on the Periodic Table. (past period 3)
Sulfur has 6 electrons in its outer energy level. This means it needs 2 more electrons to fill its outer energy level, for a total of 8 electrons.
8 electrons
Chlorine has seven electrons in its outer energy level (valence shell). To achieve a full outer energy level, which requires eight electrons, chlorine needs to gain one electron. Therefore, chlorine typically gains one electron to fill its outer energy level and achieve stability.
Hydrogen is an atom that does not need 8 electrons in its outer energy level to be stable. Hydrogen only needs 2 electrons to fill its outer energy level.
Helium and neon will have their outer energy level filled with two electrons. Helium has 2 electrons in its only energy level, while neon has 8 electrons in its second energy level.
It needs to lose one electron so that it can have 8 electrons in its outer orbital
Atoms with fewer than 8 valence electrons can fill their outermost energy level by forming chemical bonds with other atoms. For example, magnesium can lose 2 electrons to achieve a full outer energy level, becoming a +2 cation. Conversely, sulfur can gain 2 electrons to fill its outer energy level, becoming a -2 anion. Both processes result in stable, filled outer energy levels for the atoms involved.
Beryllium has two electrons in its outermost energy level (the 2s subshell). To achieve a full outer energy level, which requires a total of eight electrons (octet rule), beryllium typically loses these two outer electrons. By losing these electrons, beryllium achieves a stable electron configuration similar to that of the nearest noble gas, neon.
it has 7 valence electrons, which is the number of electrons on the outer energy level, so it needs 7.
Nitrogen has two energy levels. The first energy level contains two electrons. The second energy level contains five electrons. Number of Protons/Electrons: 7 Number of Neutrons: 7
no. of electrons to fill an energy level = 2n2. = 2x32 = 18
Electron shells of astatine: 2, 8, 18, 32, 18, 7 (electrons/shell)