According to molecular orbital theory, which of the following will not be a viable molecule . Franchisee | Li2+ is more stable than Li2− because Li2− has more numbers of antibonding electrons. For example, to give you a glimpse at where we are headed, the following are orbital diagrams for … Preparing for entrance exams? Hence, L i X 2 X 2 + must be less stable than L i X 2 due to half bond character. , The following MO diagram is appropriate for Li2 and Be2. Email, Please Enter the valid mobile Because $\ce{Li2}$ is homonuclear, the weight that imposed on each $\mathrm{2s}$ $\ce{Li}$ atomic orbital would be almost the same. Even though $\ce{Li2-}$ is unstable by filling an antibonding orbital, it will be offset by filling two electrons into the bonding orbital and it has the same bond order as $\ce{Li2+}$ does. The thermodynamic stability of LiC 6 and Li 2 C 2 is investigated by an approach combining differential scanning calorimetry (DSC), X-ray diffraction (XRD) and long-time annealing experiments. 1 Approved Answer. askiitians. To answer the question, you must construct a molecular orbital (MO) diagram for the hypothetical He 2 molecule. Li2 only has 2 electrons. 3 d–f. The species in which the N atom is in a state of sp hybridization is: NO. Explanation: The first step in predicting the stability of a specie is knowing its molecular orbital configuration and bond order. According to molecular orbital theory, H2+ has an unpaired electron in the bonding orbital. 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. They will first fill the lower energy orbitals, and then they will fill the higher energy orbitals. If the distribution of electrons in the molecular orbitals between two atoms is such that the resulting bond would have a bond order of zero, a stable … The following MO diagram is appropriate for Li2 and Be2. Electrons will fill according to the energy levels of the orbitals. According to molecular orbital theory, which of the following will not be a viable molecule? Diatomic Species by Molecular Orbital Theory. Hence li2+>li2-So finally Li2>li2+ >li2- 3 years ago The thermodynamic stability of LiC 6 and Li 2 C 2 is investigated by an approach combining differential scanning calorimetry (DSC), X-ray diffraction (XRD) and long-time annealing experiments. askiitians. But if one or more molecular orbitals are singly occupied it … In this type of hybridization one- s and two P-orbitals of the valence shell of carbon atom take part in hybridization go give three new sp 2 hybrid orbitals. Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Explanation: The first step in predicting the stability of a specie is knowing its molecular orbital configuration and bond order. Refund Policy, 26 If the Specie has a bond order of one or more, it is expected to exist in a stable form. Sitemap | Bond Order=2(bonding electrons)−0(anti−bonding e−)2=1. Both Li2+ and Li2- have the same bond order but because Li2- has more electrons in its antibonding orbitals it will be less stable. The MOs for the valence orbitals of the second period are shown in Figure 11. Be2 is stable and paramagnetic, but Li2 is unstable. Similarly, in molecular orbital theory, σ orbitals are usually more stable than π orbitals. However, this is not always the case. The answer is C2- because of bond orders When we draw the C2 MO, we have everything up till the PiPy Orbitlal filled, and the next orbital tht would be filled would be the sigma2Pz orbital. Bond order is an index of bond strength and is used extensively in valence bond theory. which response lists only the molecules given below that have unpaired electrons (Li2, Be2, B2, C2, N2) B2 which response lists only the molecules given below that are paramagnetic (B2, C2, N2, O2, F2) Highly stable bond orders are usually very long, covalent bonds. 18 vertical columns. , Considering this, is li2 unstable? Bond order of li2 is 1 while li2- and li2+ is o. Bonds with an order of 3 are considered very strong. Unstable isotopes do not. Because $\ce{Li2}$ is homonuclear, the weight that imposed on each $\mathrm{2s}$ $\ce{Li}$ atomic orbital would be almost the same. Your question is wrong because be2 molecule does not exist as be2 number of electron is 8 so according to … Be2 is stable and paramagnetic, but Li2 is unstable. The results of ac and dc conductivity measurements on Li 2 ZrO 3, Li 4 ZrO 4, and LiScO 2 show that these phases are Li ion conductors. So, the bond order is zero. Li2+ is more stable than Li2− because Li2− has more numbers of antibonding electrons. (1) Both are unstable (2) Li2- is unstable and Li2- is stable (3) Li2- is stable and Li2 - … The charge and discharge curves of the two collectors at 1st, 10th and 50th cycles with a current density of 1 mA cm −2 and a capacity of 1 mAh cm −2 are shown in Fig. Under standard conditions, it is the lightest metal and the lightest solid element. Tutor log in | Privacy Policy | 6 regular electrons of neutral molecule taked place in sigma1, simga*1, and two seprated electrons in two Pi1 orbitals. Be2 Is Stable And Diamagnetic, Bit Li2 Is Unstable. Careers | The following MO diagram is appropriate for Li2 and Be2. If number of electrons more in antibonding orbital the molecule become unstable. Based on this diagram, Be2+ is more stable that Be2, and Be2 is more stable that Be2-. Information about the thermodynamic stability of LiC 6 in the literature is ambiguous at present. About Us | (2)  Li2- is unstable and Li2-  is stable, (3)  Li2- is stable and Li2 - is unstable, Both Li2+ and Li2-  has 0.5 bond order and hence both are stable. Based on this diagram, both are stable and diamagnetic. Hence li2+ contain 2 antibonding, li2- contains 3 antibonding. They are both paired, so it is diamagnetic. explain Sep 12 2011 01:41 AM. Also question is, is be2 2 paramagnetic or diamagnetic? The species in which the N atom is in a state of sp hybridization is: NO. Learn in our Free Webinar. Media Coverage | – will exist, explain many properties – for example why O 2 is a paramagnetic diradical – and identify the important frontier molecular orbitals (FMOs). Dear If the Specie has a bond order of one or more, it is expected to exist in a stable form. Similarly, is li2 stable or unstable? What am I missing now? subject. 5So li2 is more stable among 3,Now in li2- and li2+ we have to check antibonding electron,, less antibonding more stability. Previous Year Papers. Be2 Is Stable And Paramagnetic, But Li2 Is Unstable. Register Now. The LibreTexts libraries are Powered by MindTouch ® and are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. Register yourself for the free demo class from Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students. Points, Please choose a valid SaralStudy helps in prepare for NCERT CBSE solutions for Class 11th chemistry. So Li2- is a more stable by molecular orbital study, but a negtive charge on a tiny molecule is not favorable at all. 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. Degenerate atomic orbitals from SaralStudy order or zero bond order they will fill. Ncert CBSE solutions for Class 11th from SaralStudy in species are spin paired, the substance is diamagneti molcular... In the excited state is this diagram, Li2 is unstable than π orbitals, it is to! 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