Question

Why hydrogen is placed in middle of sblock & pblock?

Answer 1

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Hydrogen has one valence electron like lithium, sodium, etc. But it is a nonmetal, and it does not form ionic compounds except as an anion. Group 1 elements always form cations in ionic compounds.

Hydrogen needs just one electron to complete its valence shell, like fluorine, chlorine, etc.

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Answer 2

Explanation:

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Why hydrogen (H) is placed in between s-block and p-block?

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$\huge\underline{\underline{\ Answer}}$

Hydrogen is the element which shows similarity with s-block and p-block elements.

• Properties similar to s-block

1. Electronic configuration are similar they have single electron in their outermost shell [ns1]
2. They form same nature of oxides [Eg:- H2O, Na2O, K2O.....etc]
3. They also have same oxidation state. And that is +1
4. In case of Electrolysis, NaCl -------> Na+ and Cl- HCl ---------> H+ and Cl-

• Properties similar to p-block (halogens)

1. H will require only 1 electron to complete it's duplet and become stable Cl will also require only 1 electron to complete it's octate and become stable.
2. They form same nature covalent compound. Eg:- [CH4, NH3 ] and [CCl4,NCl3]
3. Ionisation energy is also almost same

So, now it became confusing to where we should place hydrogen..

So, we placed hydrogen between the two blocks

You will find in many periodic table it is placed in s-block and in many in p-block but actual and correct placement of hydrogen is in middle..