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if the symbol x represents a central atom, y represents outer atoms, and z represents lone pairs on the central atom, the structure (2 lone pairs around x) could be abbreviated as xy2z2. classify these structures according to their shape.

molecular geometries:

linear
bent 120
bent 109
trigonal pyramidal
t-shaped
see saw
square planar
square pyramidal

possiblities:

xy4z2
xy5z
xy2z
xy2z3
xy4z
xy2z2
xy3z2
xy3z

Answer : The molecular geometry and bond angle of the given molecule is, bent and respectively.

Explanation :

As we are given that, 'X' is the central atom and 'Y' is the neighboring atom and 'Z' represents lone pairs on the central atom. The given molecule is, .

In the given molecule, there are 2 bond pairs of electrons and 2 lone pairs of electrons. Thus, there are total 4 electron pairs that means the hybridization will be and the electronic geometry of the molecule will be tetrahedral.

But as there are two atoms around the central atom, the third and fourth position will be occupied by lone pair of electrons. The repulsion between lone and bond pair of electrons is more and hence the molecular geometry will be bent or angular and the bond angle will be, .

Hence, the molecular geometry and bond angle of the given molecule is, bent and respectively.

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.