Diprotons are not stable; this is due to spin-spin interactions in the nuclear force, and the Pauli exclusion principle, which forces the two protons to have anti-aligned spins and gives the diproton a binding energy greater than zero. Since there are as many bonding electrons as as antibonding, there is no net bond. Excited state doesn't have lower energy! It was to my understanding that He2 = Helium Gas = what we used to put in party balloons? 71% Upvoted. How to turn a weak acid into a strong acid. Faster, greener way of producing carbon spheres, Discovery boosts theory that life on Earth arose from RNA-DNA mix, New chemistry for controlling the volume of liquid in volumetric additive manufacturing, http://pubs.acs.org/doi/abs/10.1021/ed084p860, Roughly 20% of the molecules in the air are oxygen molecules. The larger the bond order, the more stable the molecule. Is unstable molecule with bond order of 1/2 and it is diamagnetic. But we are talking about molecule that is not a standard one - it has a filled antibonding oribtal, which makes is completely unstable in the ground state. This thread is archived. The spontaneous decay of an unstable heavier nucleus with a simultaneous emission of certain radiations is called radioactivity. O 2 + is more stable than O 2-.Because According to molecular orbital theory O 2 + has 15 electrons &it has one electron in antibonding orbital. 3 comments. Suppose you're correct, then why would stabler excited He2 molecules, Because in the ground state the antibonding effect of the antibonding orbitals gets higher than in the excited molecule - and it gets high enough for the molecule to become unstable. save. with this explanation, excited-state configuration (...) seems stabler than ground-state configuration (...) while it's not the case. The bond that holds this dimer together is so weak that it will break if the molecule rotates, or vibrates too much. report. On moving from group 1 to group 2 i.e. This chemical is the largest diatomic molecule—a molecule consisting of two atoms bonded together. Can You Describe the Smell of Ammonia to Me? was last updated on 28th December 2020 Di helium cation (He2+) possess three electron over all two are present in bonding sigma molecular orbital and are paired and one electron in antibonding sigma orbital which is unpaired. The electrons in antibonding orbitals cancel (and exceed) the stabilization resulting from electrons in bonding orbitals. 4- Theoretically it would not be possible to form a molecule from two hydrides because the anti-bonding and bonding orbitals would cancel each other out. Answer. Postby Nhi Vo 3A » Tue Oct 25, 2016 7:08 pm, Postby Chem_Mod » Tue Oct 25, 2016 11:31 pm, Users browsing this forum: No registered users and 2 guests. If number of electrons more in antibonding orbital the molecule become unstable. Noboru, the cat below, is the administrator of this unstable place. New comments cannot be posted and votes cannot be cast. Which nuclear particle is identical to an He2+ ion? 3- H 2 is the most stable because it has the highest bond order (1), in comparison with the bond orders (1/2) of H 2 + and H 2-. To answer the question, you must construct a molecular orbital (MO) diagram for the hypothetical He 2 molecule. So, the bond order is zero. Answer and Explanation: b. That's where you are wrong. Is there any additional information you can share with us? Why is he2+ stable? For a better experience, please enable JavaScript in your browser before proceeding. How could Helium gas be nonexistent? a. Eg: He + He; same mixing as above. d. Is stable molecule with bond order of 3 and it is paramagnetic. For a bond to be stable, the bond order must be a positive value. If the ball is only slightly pushed, it will settle back into its hollow, but a stronger push may start the ball rolling down the slope. The He H- system is isoelectronic with the He2 van der Waals molecule. Removing green copper oxides with Electrolysis, chemicals, etc. Polarity in water molecule and electronegativity of oxygen in that molecule. SaralStudy helps in prepare for NCERT CBSE solutions for Class 11th chemistry. This is a question in "Chemical Principles, 6th Edition, Steven Zumdahl": I'm sorry you are not finding help at the moment. It can only exist at very low cryogenic temperatures. It has a higher energy, which is what makes the antibonding effect weaker. molecular orbital diagram of O 2 + Electronic configuration of O 2 + In the case of O 2-17 electrons are present &3 electrons are present in antibonding orbitals. 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Click hereto get an answer to your question ️ Among H2 , He2^+ , Li2 , Be2 , B2 , C2 , N2 , O2^- , and F2 , the number of diamagnetic species is (Atomic numbers: H = 1 , … Therefore, He2 molecules are not predicted to be stable (and are not stable) in the lowest energy Which type of radiation emitted by radioactive nuclei is similar in mass to a helium atom? 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