how he2 does not exist according to vbt
Answers
Each helium atom has two electrons in 1s-orbital and therefore, there are four electrons in He2 molecule. These electrons will be accommodated in si1ls and s*1s MOs as shown below.
The electronic configuration for helium molecule may be written as:
He2: (s1s)2 (s*1s)2
calculation of bond order in helium
The zero bond order value indicates that there is no net bonding and He2 molecule should not be formed. In fact, there is no experimental evidence for the existence of this molecule.
student-name Vibhav Joshi answered this
if u draw or note the no. of repulsive and attractive forces then He2 has 5 repulsive and only 4 attravtive forces thus due to increased repulsion the atoms get separated or can't come closer to form a bond.
student-name Kshitiz answered this
He2 molecule does not form because the no. of new repulsive forces is 5 but the no. of new attractive forces is only 4.
Answer:
Explanation:
Definition of helium:
A chemical element of the noble gas group that is particularly prevalent in natural gases and is mostly utilized to fill airships and balloons, cool superconductors, and make up inert atmospheres.
Definition of electronic configuration:
The distribution of electrons in an element's atomic orbitals is described by the element's electron configuration. Atomic electron configurations adhere to a standard nomenclature in which all atomic subshells that contain electrons are arranged in a sequence with the number of electrons they each hold expressed in superscript.
Definition of bond order:
The number of chemical bonds between a pair of atoms is indicated by the bond order. For instance, the bond order of the diatomic nitrogen atoms, and the carbon atoms, are both three. The bond order explains the bond's stability.
He2 does not exist according to vbt:
He is in the electronic configuration of 1s 2
Formula of bond order :
(number of electrons in the chemical orbital forming the bond) - (No. of electrons in anti-bonding Molecular orbital) / 2
= ( 2 - 2 ) /2
= 0
∴He 2 bond order is zero. In He 2, there is no link between any of the atoms. He 2 does not thus exist.
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