Each silicon atom is surrounded by four oxygen atoms and each oxygen atom is bonded to two silicon atoms

Each silicon atom is surrounded by two oxygen atoms and each oxygen atom is bonded to two silicon atoms

Silicon atoms is bonded to two oxygen atoms

there are double bonds between silicon and oxygen atoms

four 2c-2e bonds and two 3c-2e bonds

two 2c-2e bonds and four 3c-2e bonds

two 2c-2e bonds and two 3c-3e bonds

four 2c-2e bonds and four 3c-2e bonds

Zr and Y have about the same radius

Zr and Nb have similar oxidation state

Zr and Hf have about the same radius

Zr and Zn have the same oxidation

Poor shielding of one of 4f electron by another in the subshell

Effective shielding of one of 4f electrons by another in the subshell

Poorer shielding of 5d electrons by 4f electrons

Greater shielding of 5d electrons by 4f electrons