Which one of the following about an electron occupying the 1 s orbital in a hydrogen atom is incorrect ? (Bohr's radius is represented by a $a_0$)

• A

  The probability density of finding the electron is maximum at the nucleus
• B

  The electron can be found at a distance $2 \mathrm{a}_0$ from the nucleus
• C

  The 1 s orbital is spherically symmetrical
• Correct answer
  D

  The total energy of the electron is maximum when it is at a distance $a_0$ from the nucleus

Solution

1. $\Psi^2=$ Probability density is maximum at nucleus.
2. Electron can exist upto infinity from nucleus.
3. True
4. Energy of electron is maximum at infinite distance from nucleus.

Hence, the correct answer is option: 'D'.