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What is the valency of helium?
Helium has a valency of 0 because it has a full outer shell with 2 electrons, making it stable and unreactive.
What is the number of valency electron in helium?
Helium has two valence electrons.
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.
Why you take the valency of helium 0?
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.
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.
Which element has highest valency?
The element with the highest valency is fluorine, which has a valency of 7. This means that fluorine can form compounds by gaining one electron to complete its outer shell and reach a stable electron configuration.
What is the valency of lithium?
The valency of lithium is 1. It has one valence electron in its outer shell.
What is valency of tungsten?
the valency is 4
What is valency of argon?
Its valency is 0.
Why do helium neon and argon have a zero valency?
Helium, neon, and argon have a zero valency because they have a full outer electron shell (valence shell). This makes them stable and unreactive because they do not need to gain, lose, or share electrons to achieve a full valence shell. Since they already have a complete set of electrons, they do not form chemical bonds easily.
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 valency of nitrite?
the valency for nitrite is 5
