8
No, it doesn't have a complete octet. Phosphorous is in group 5A, meaning it has 5 valence electrons (5 electrons on its outest shell).
The d shell needs 10 electrons to be complete.
A complete valence shell typically holds 8 electrons. However, for elements in the first two rows of the periodic table, the valence shell can hold a maximum of 2 electrons in the first shell and 8 electrons in the second shell.
Fluorine has 7 electrons in its outer shell, and it needs 1 more electron to complete its valence shell, which can hold a total of 8 electrons.
Nitrogen needs 3 more electrons to have a complete valence shell of 8 electrons. Nitrogen has 5 electrons in its valence shell, and a complete valence shell for nitrogen would have 8 electrons to achieve stability.
An atom of oxygen needs 2 electrons to complete its outer shell, which can hold a total of 8 electrons. Oxygen has 6 electrons in its outer shell, so it will gain 2 electrons through bonding to achieve a full valence shell.
These are the noble gases which have a complete valence shell.
8
Generally, a compete valence shell holds EIGHT electrons.
Carbon has four electrons in its outer shell and needs four more electrons to complete its octet.
Two elements that need 3 electrons to complete their valence shell are nitrogen and phosphorus. Nitrogen has 5 electrons in its valence shell and needs 3 more to have a full shell, while phosphorus has 5 electrons in its valence shell as well and requires 3 more to achieve stability.
There are two electrons in the first shell of neon. Its complete electronic configuration is 2,8