Sodium has an atomic number of 11, meaning that it has 11 protons and 11 electrons. The first ten electrons fill the first two energy levels, while the eleventh electron is the valence electron. This means that sodium is a metal, and it bonds by donating its valence electron to other atoms.

When sodium bonds with another atom, the two atoms are held together by an ionic bond. This is because the sodium atom donates its electron to the other atom, which results in a positive ion and a negative ion. The positive and negative ions are then attracted to each other, and this attraction holds them together.

Sodium bonds with a variety of other atoms, including chlorine, fluorine, oxygen, and sulfur. These bonds are all ionic bonds, and they all result in the formation of a positive sodium ion and a negative ion of the other atom.

Sodium also bonds with itself to form a metal lattice. In a metal lattice, the sodium atoms are arranged in a regular pattern, and they are all bonded to each other by ionic bonds. The metal lattice is responsible for the characteristic properties of sodium, such as its high electrical and thermal conductivity.