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Noble gases have electronegativity values of zero because they have completed the fulfillment of their orbitals and are no longer looking to bond with anymore electrons.
There are exceptions with Krypton, Xenon, and Radon though.
Wiki User
∙ 13y ago
Wiki User
∙ 12y agobecause it has 8 electrons in its outermost cell or orbit which means it cannot take part in any chemical reaction
Wiki User
∙ 11y agoHelium does not react with any other elements due to its stable electronic configuration. Hence the valency of helium is zero.
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What is the number of valency electron in helium?
Helium has two valence electrons.
How man valence electrons does lithium?
in modern periodic table the elements are arranged in groups according to their valency . valency increases from 1 to 4 and then decreases from 4 to 0. thus as lithium belongs to third group its valency is 3
Which element has highest valency?
8 which is a full outer electron shell. There are two exceptions: Helium(He) and Hydrogen(H) which can only have 2 electrons in their outer shell.
Why is it wrong to say that 50c helium is twice as hot as 25c helium?
because the centigrade scale has 0 where there is not 0 heat
What is the valency for plumbic?
+4 valency
What is the valency of helium?
The valency of Helium is 0
What is the valency of helium be?
helium's valency is zero as id does not combine with other elements
What is the number of valency electron in helium?
Helium has two valence electrons.
Why do helium neon argon have a 0 valency?
Noble gases such as helium, neon, argon etc have completely filled valence orbitals, and hence have sable electronic configuration. They do not form bond with other elements. In other words, they are chemically inert and have zero valency.
When helium's electrons in the outer most shell is two why its valency is 0?
Valency is not the no. of electrons in the outermost shell. It is the no. of electrons an atom has to lose or gain or share to achieve the electronic configuration of nearest noble gas and bcome stable. However, Helium has only K-shell which is complete. Hence it is stable and a noble gas. Therefore, its valency is zero.
What is valency of argon?
Its valency is 0.
What is the valency of neon and argon?
valency of argon is 0 that the shell is completely filled
How does Cl2 having valency 0 react with H2 also having valency 0 to form HCl with covalent bond?
Valency relates to atoms not molecules. A valency of one means that an atom can form one bond. Chlorine has 7 electrons in its outer shell, so forming one bond achieves the octet, so it is said to have has a valency of one. In Cl2 there is a single bond. Hydrogen has just one electron in its outer shell so forming a bond gives it a full shell of two like helium, it therefore has a valency of one. In H2 there is a single bond. In HCL there is a single bond. Valency is an old idea, predating Lewis diagrams, octets, and energy levels. It was the number of hydrogen atoms an elemnt could bond to.
What is the valency of argon?
the valency of argon is zero(0) because it is a noble gas i.e it does not react to any other element
Does the valency of hydrogen change?
Possible valencies: +1, 0, -1.
Why do helium neon and argon have a zero valency?
because helium , neon n argon have a completely filled outer shell n thus require no extra electrons. this is also the reason why they were discovered so late.
How man valence electrons does lithium?
in modern periodic table the elements are arranged in groups according to their valency . valency increases from 1 to 4 and then decreases from 4 to 0. thus as lithium belongs to third group its valency is 3
