Question: What is the bond order of the molecule He2?
Options:
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Correct Answer: 0
Solution:
He2 has a bond order of 0, as it has no net bonding electrons.
What is the bond order of the molecule He2?
Practice Questions
Q1
What is the bond order of the molecule He2?
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Questions & Step-by-Step Solutions
What is the bond order of the molecule He2?
Step 1: Identify the atoms in the molecule. He2 consists of two helium (He) atoms.
Step 2: Determine the number of electrons in each helium atom. Each helium atom has 2 electrons.
Step 3: Calculate the total number of electrons in He2. Since there are 2 helium atoms, the total is 2 + 2 = 4 electrons.
Step 4: Understand the molecular orbital theory. In this theory, electrons fill molecular orbitals starting from the lowest energy level.
Step 5: Fill the molecular orbitals for He2. The first 2 electrons fill the bonding orbital (σ1s), and the next 2 electrons fill the antibonding orbital (σ*1s).
Step 6: Count the number of bonding and antibonding electrons. There are 2 bonding electrons and 2 antibonding electrons.
Step 7: Calculate the bond order using the formula: Bond Order = (Number of bonding electrons - Number of antibonding electrons) / 2.
Step 8: Substitute the values into the formula: Bond Order = (2 - 2) / 2 = 0.
Step 9: Conclude that the bond order of He2 is 0, indicating that there is no net bonding and the molecule is unstable.
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 formation of molecular bonds through the combination of atomic orbitals, leading to bonding and antibonding molecular orbitals.
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