There's only one. Because of this it is very easy for sodium to lose that one electron so that it can have a full electron shell like that of neon. Sodium's first shell has two electrons, and it's second shell has 8 electrons.
Sodium has one electron in its outermost principal energy level, also known as the valence shell.
A neutral atom of magnesium has 2 electrons in its outermost energy level. Magnesium has a total of 12 electrons, with 2 electrons in the first energy level and 8 electrons in the second energy level. The outermost energy level is the second energy level in the case of magnesium.
Bromine has 7 electrons in its outermost energy level.
The chloride ion (Cl-) has 8 electrons on the outermost energy level.
Phosphorus has 5 electrons in its outermost principal energy level.
Sodium has one electron in its outermost principal energy level, also known as the valence shell.
As a neutral atom, sodium possesses 1 electron in its outermost (3rd) energy level. As a 1+ ion, it possesses 8 electrons in its second energy level, forming an octet, which is the optimum number of electrons for sodium to possess in its outermost energy shell.
Carbon has four electrons in the outermost energy level, which is energy level two. It needs eight electrons to have this energy level filled.
Aluminum has 3 electrons in its outermost energy level.
valence electrons are the electrons in the outermost energy level
Halogens have six valence electrons in the outermost energy level.
Sulfur has 6 electrons in its outermost energy level.
A neutral sulfur atom has 6 electrons in its outermost energy level. Sulfur has 16 electrons, with 2 electrons in the first energy level, 8 electrons in the second energy level, and 6 electrons in the third and outermost energy level.
Atoms form chemical bonds to achieve a full outermost energy level by sharing, gaining, or losing electrons. Valence electrons are the electrons in the outermost energy level of an atom, and having a full outermost energy level makes the atom more stable. This stability is achieved when there are eight electrons in the outermost energy level, known as the octet rule.
A neutral atom of magnesium has 2 electrons in its outermost energy level. Magnesium has a total of 12 electrons, with 2 electrons in the first energy level and 8 electrons in the second energy level. The outermost energy level is the second energy level in the case of magnesium.
Fluorine has 7 electrons in its outermost energy level. Its electron configuration is 2-7, with 7 electrons in the outermost energy level, making it highly reactive.
Carbon has four electrons in the outermost energy level, which is energy level two. It needs eight electrons to have this energy level filled.