If the symbol x represents a central atom, y represents outer atoms, and z represents lone pairs on the central atom, the structure y-: x: -y could be abbreviated as xy2z2.
classify these structures according to their shape.
xy2z, xy2z2,xy2z3,xy3z, xy3z2,xy4z, xy4z2,xy5z the categories are linear, bent(~120), bent(~109), trigonal pyramidal, t-shaped, see-saw, square planar, square pyramidal

1) Bent(120)

2) Bent (109)

3) Linear

4)Trigonal Pyramidal

5)t-shaped

6)see-saw

7)Square planar

8)Square pyramidal

Explanation:

1) XY₂Z:

Central atom = X

# Bonds around X = 2 X-Y bonds

# Lone pairs = 1

Shape = Bent (~120)

2) XY₂Z₂:

Central atom = X

# Bonds around X = 2 X-Y bonds

# Lone pairs = 2

Shape = Bent (~109)

3) XY₂Z₃:

Central atom = X

# Bonds around X = 2 X-Y bonds

# Lone pairs =3

Shape = Linear

4) XY₃Z:

Central atom = X

# Bonds around X = 3 X-Y bonds

# Lone pairs = 1

Shape = Trigonal Pyramidal

5) XY₃Z₂:

Central atom = X

# Bonds around X = 3 X-Y bonds

# Lone pairs = 2

Shape = t-shaped

6) XY₄Z:

Central atom = X

# Bonds around X = 2 X-Y bonds

# Lone pairs = 1

Shape = see-saw

7) XY₄Z₂:

Central atom = X

# Bonds around X = 4 X-Y bonds

# Lone pairs = 2

Shape = Square planar

8) XY₅Z:

Central atom = X

# Bonds around X = 5 X-Y bonds

# Lone pairs = 1

Shape = Square pyramidal

if the concentration of products is decreased, the equilibrium will shift toward the products). add an inert gas (one that is not involved in the reaction) to the constant-volume reaction mixture: this will increase the total pressure of the system, but will have no effect on the equilibrium condition.

explanation:

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.