out of H2Se SiO2 H2O CO2 which of these does not arrange itself into tetrahedral environment when bonding ins a solid state?

ok i don't know i need help with this big time

There is electronic geometry as well as molecular geometry. The question doesn't specifiy which and it should. However, the answer PROBABLY is CO2 since that is a linear molecule.
O=C=O or
:O::C::O: and put two more dots above each O.

To determine which molecule does not arrange itself into a tetrahedral environment when bonding in a solid state, we need to understand the electronic and molecular geometry of each molecule.

Electronic geometry refers to the arrangement of electron groups around the central atom. Molecular geometry, on the other hand, describes the arrangement of atoms in a molecule, considering both bonding and non-bonding electron pairs.

In a tetrahedral environment, there are four electron groups arranged around a central atom, forming a regular tetrahedron. Each electron group could be a single bond, double bond, or a lone pair of electrons.

Let's analyze each molecule given:

1. H2Se (Hydrogen Selenide):
Electronic geometry: Tetrahedral (due to four electron groups including two bonding
pairs and two lone pairs).
Molecular geometry: Bent (V-shaped), but it contains a tetrahedral electron geometry.

2. SiO2 (Silicon Dioxide):
Electronic geometry: Tetrahedral (due to four electron groups around silicon atom).
Molecular geometry: Linear (due to two double bonds between Si and O atoms).

3. H2O (Water):
Electronic geometry: Tetrahedral (due to four electron groups including two bonding
pairs and two lone pairs).
Molecular geometry: Bent (V-shaped), but it contains a tetrahedral electron geometry.

4. CO2 (Carbon Dioxide):
Electronic geometry: Linear (due to two electron groups formed by double bonds).
Molecular geometry: Linear (since there are no lone pairs or unshared electron pairs on
the central carbon atom).

Based on the explanation above, the molecule that does not arrange itself into a tetrahedral environment when bonding in a solid state is CO2 (Carbon Dioxide).