Question

Posting this 4 the second, bacchi ko kitna sataoge koi toh answer kardo yrrr

Explain: Boron forms...[AlF6]3-

Diagonal relationship

Periodic classification

Intermediate first year chemistry

Answer 1

Boron has an absence of d orbital which limits it covalency to a maximum of 4 (1 in s ,3 in p) but periods further down have a d orbital too so they can expand their octets and increase covalency upto 9or more (depends upon conditions and orbitals)