Which of the following is//are not indicated by the sign of lobes in an atom ?

Options

A. Sign of charges
B. Sign of probability -distribotion
C. Sigh of wave function
D. Presence or abence of electron

Answer

To solve the question "Which of the following is/are not indicated by the sign of lobes in an atom?", we need to understand the concept of lobes in atomic orbitals and what information they provide.

### Step-by-Step Solution:

1. **Understanding Lobes and Orbitals**:
- Lobes refer to the regions in space where there is a high probability of finding an electron. These are visual representations of atomic orbitals (s, p, d, f).
- Each lobe can have a positive or negative sign, which indicates the phase of the wave function in that region.

2. **Sign of Lobes**:
- The sign of the lobes in an orbital indicates the sign of the wave function (ψ) at that point.
- This sign helps in understanding the probability distribution of electrons in an atom.

3. **Information Provided by Lobes**:
- The sign of lobes indicates:
- The sign of the wave function (positive or negative).
- The probability distribution of electrons (where they are likely to be found).
- The presence or absence of electrons in the orbital.

4. **What the Sign of Lobes Does Not Indicate**:
- The sign of lobes does not indicate the charge of the electron or the atom. The charge is a separate property and is not determined by the wave function's sign.

5. **Conclusion**:
- Therefore, the correct answer to the question is that the sign of lobes does not indicate the charge of the electron or the atom.

### Final Answer:
The correct option is **option A**, as it is not indicated by the sign of lobes in an atom.