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An electron in a hydrogen atom is in the (n,l,ml) = (2,1,0) state.

(a) Calculate the probability that it would be found within 60 degrees of z-axis, irrespective of radius.

(b) Calculate the probability that it would be found between r = 2a0 and r = 6a0, irrespective of angle.

(c) What is the probability that it would be found within 60 degrees of the z-axis and between r = 2a0 and r = 6a0?

Short Answer

Expert verified

a) The probability that it would be found within 60 degrees of z-axis = 0.875.

(b) The probability that it would be found between r = 2a0 and r = 6a0= 0.662.

(c) The probability that it would be found within 60 degrees of the z-axis and between r = 2a0 and r = 6a0 = 0.58.

Step by step solution

01

Given data

The state is given as(n,l, m)=(2,1,0).

02

(a) Probability that electron would be found within 60 degrees of the z-axis

Orbitals are the regions in the space where electrons are found, and there is a very high probability of the presence of electrons in its orbital. The shape of the orbital is defined by the Azimuthal quantum number 鈥榣鈥.

To find the probability between =0and =60and between =60and =180. Due to symmetry, you will double the integral from =0to =60and will get our answer.

Where, =Angle between electron and z-axis with respect to the origin.

Probability can be calculated as:

P1=20/334cos22sind=30/3cos2sind=3-3cos330/3=0.875

Thus, The probability that it would be found within 60 degrees of z-axis = 0.875.

03

(b) Probability that it would be found between r = 2a0 and r = 6a0

Where, a0= radius of the hydrogen atom

If only the radial part of the wave function is involved, and R2,1(r) is the same for the (2,1,0) state as for a (2,1,+1) state,

Hence, Probability can be calculated as:

P2=/32/338sin22sind=34/32/3sin3d=341112=0.688

Thus,the probability that it would be found between r = 2a0 and r = 6a0= 0.662.

04

(c) The probability that it would be found within 60 degrees of the z-axis and between r = 2a0 and r = 6a0

Probability can be calculated as:

Probability = p1 x p2

= 0.875 x 0.662 [from eq. 1 and eq. 2]

= 0.58

Thus, the probability that it would be found within 60 degrees of the z-axis and between r = 2a0 and r = 6a0 = 0.58.

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