Which is more stable he or He2+?
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Which is more stable he or He2+?
In the molecular cation of helium, one electron is less. Thus, three electrons are to be filled in the molecular orbitals. Two electrons will occupy bonding molecular orbital while one will occupy antibonding orbital. So, He2+2 H e 2 2 + is more stable than He+2 H e 2 + .
Why is H2 more stable than He2?
H2+ will be more stable than He2+ because while they both have same bond order, He2+ has anti bonding electrons which destabilizes the molecule.
Why is He2 not stable?
According to molecular orbital theory He2 has 2 electrons in sigma 1s bonding and 2 in sigma 1s antibonding. So its bond order comes out to be 0 and a molecule must have a bond order of atleast 1 to exist thats why He2 doesnt exist.
Is He2 2 stable or unstable?
Therefore, He2 molecules are not predicted to be stable (and are not stable) in the lowest energy ground state. However, in a high-energy environment, electron(s) from the antibonding orbitals in He2 can be promoted into higher-energy bonding orbitals, thus giving a nonzero bond order and a “reason” to form.
Does He2+ exist as a stable molecule?
And this is from the solutions manual: The ground state MO electron configuration for He2 is (σ1s)2(σ1s*)2 giving a bond order of 0. Therefore, He2 molecules are not predicted to be stable (and are not stable) in the lowest energy ground state.
Why is H2 more stable?
In H2- ion, one electron is present in anti bonding orbital due to which destabilizing effect is more and thus the stability is less than that of H2+ ion.
Which molecule is more stable explain H2 H2 and H2?
In H2- ion one electron is present in anti bonding orbital due to which destabilizing effect is more and thus the stability is less than that of H2+ ion. Give reason why `H_(2)`, ions are more stable than `H_(2)` though have the same bond order.
Why He2 does not exist but He2 does?
According to valence bond theory,halfilled atomic orbitals can overlapp to form a bond. Thus two hydrogen atoms along with halffilled 1s orbital,overlapp with each other to form H₂ molecule. Filled orbital can not overlapp and hence cannot form a bond. Hence diatomic helium i.e.He₂ molecule does not exist.
Is He2 theory stable Mo?
Re: Why is He2 not a stable molecule? [ENDORSED] The σ1s bonding and antibonding orbitals will be full. Calculating the bond order results in 0. In other words, no bond can be sustained between two He atoms according to MO theory.
How do you know if a molecule is stable?
Rules for estimating stability of resonance structures
- The greater the number of covalent bonds, the greater the stability since more atoms will have complete octets.
- The structure with the least number of formal charges is more stable.
- The structure with the least separation of formal charge is more stable.
Why He2 does not exist but He2+ and He2 exist?
Answer Expert Verified The number of electrons in is 4. When bond order is 0, such a molecule does not exist. The bond order is not equal to 0, hence this molecule exists. Therefore, exists while does not exist.