AP BIOLOGY

Detailed explanation-1: -Oxygen can form only two bonds because it requires two electrons to complete its octet after which it will not have any more vacant orbitals left to accept more electrons and form more bonds.

Detailed explanation-2: -How many covalent bonds hold the oxygen molecule together? A: The two oxygen atoms share two pairs of electrons, so two covalent bonds hold the oxygen molecule together.

Detailed explanation-3: -From the perspective of living systems two of the most interesting elements are nitrogen and oxygen. Carbon has six electrons (two core and four valence) and can form four bonds with neighboring atoms.

Detailed explanation-4: -The number refers to the number of bonds each of the element makes: Hydrogen makes 1 bond, Oxygen makes 2 bonds, Nitrogen makes 3 bonds and Carbon makes 4 bonds.

Detailed explanation-5: -Two oxygen atoms strongly bind together with a covalent double bond to form dioxygen or O2. Oxygen is normally found as a molecule. It is called dioxygen.