p-Block Elements notes
OpenThe 4 formulas you need for p-Block Elements, on one page.
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Chemistry · printable
p-Block Elements: One-Page Formula Sheet
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Last updated: 26 October 2026
Formula sheet
p-Block Elements formulas
p-Block Elements — formula sheet
Formulas
- Oxoacids of P: H₃PO₂ (monobasic), H₃PO₃ (dibasic), H₃PO₄ (tribasic)
- Bond angle order: NH₃ > PH₃ > AsH₃
- Acidity of hydrogen halides: HI > HBr > HCl > HF
- Thermal stability of hydrides decreases down a group
Key ideas
- Inert pair effect: lower oxidation states become stable down the group
- Oxoacid acidity rises with oxidation state of the central atom
- Structures of XeF₂, XeF₄, XeF₆ follow VSEPR
- Diborane has 3-centre–2-electron bonds
Traps to avoid
- Counting P–H bonds as acidic hydrogens
- Wrong structures of interhalogens
- Ignoring NCERT exceptions
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FAQs
Frequently asked questions
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Read it once a day for a week, then cover it and write the formulas from memory. Revise only the ones you missed.