For which of the following molecules is the bond order equal to 0?

For which of the following molecules is the bond order equal to 0?

Step 1: Understand what bond order means. Bond order is a measure of the number of chemical bonds between a pair of atoms.
Step 2: Recall the formula for bond order: Bond Order = (Number of bonding electrons - Number of antibonding electrons) / 2.
Step 3: Identify the molecule in question, which is He2 (helium dimer).
Step 4: Determine the number of electrons in He2. Each helium atom has 2 electrons, so He2 has a total of 4 electrons.
Step 5: In He2, the 2 electrons will fill the bonding molecular orbital, and the other 2 electrons will fill the antibonding molecular orbital.
Step 6: Count the bonding and antibonding electrons: 2 bonding electrons and 2 antibonding electrons.
Step 7: Apply the bond order formula: Bond Order = (2 bonding - 2 antibonding) / 2 = (2 - 2) / 2 = 0.
Step 8: Conclude that the bond order for He2 is 0, meaning there is no bond between the two helium atoms.

Bond Order – Bond order is a measure of the number of chemical bonds between a pair of atoms, calculated as the difference between the number of bonding and antibonding electrons divided by two.
Molecular Orbital Theory – Molecular orbital theory explains the behavior of electrons in molecules, including the formation of bonding and antibonding orbitals.