Which of the following is true ?

Options

A. A configuration will the maximum spin multipicity has the minimum energy and thus is most stable
B. The energy of `3d` orbit may be greater than or losser then or equal to the of `4s` orbital depending upon the atomic number of the atom
C. All p orbitals have the same type of angular dependence irrespective of the value of principal quantum numbe rn
D. Ina given electrical field `beta` particle are effected more then `alpha` particle in spin of `alpha ` particle having larger charge

Answer

To determine which statements are true, we will analyze each statement one by one based on the principles of atomic structure and quantum mechanics.

### Step-by-Step Solution:

1. **Statement A**: "A configuration with maximum spin multiplicity has maximum energy and thus is most stable."
- According to Hund's Rule, electrons fill degenerate orbitals (orbitals of the same energy) singly first, with parallel spins, to maximize the number of unpaired electrons. This configuration minimizes the repulsion between electrons and thus has lower energy, making it more stable. Therefore, this statement is **false**.

2. **Statement B**: "The energy of 3d orbitals may be greater than, lower than, or equal to that of 4s orbital depending upon the atomic number of the atom."
- The energy levels of orbitals depend on their principal quantum number and the effective nuclear charge experienced by the electrons. Generally, for transition metals, the 4s orbital is filled before the 3d orbital, and after filling, the 3d orbitals can be lower in energy than the 4s. However, this relationship does not depend solely on the atomic number but rather on the specific electron configuration. Thus, this statement is **true**.

3. **Statement C**: "All p-orbitals have the same type of angular dependence irrespective of the value of the principal quantum number."
- The angular dependence of orbitals is determined by the azimuthal quantum number (l). For p-orbitals, l = 1, which means they all have the same shape (dumbbell-shaped) and angular dependence, regardless of the principal quantum number (n). Hence, this statement is **true**.

4. **Statement D**: "In a given electric field, beta particles are affected more than alpha particles due to the spin of alpha particles having larger charge."
- Alpha particles are positively charged helium nuclei and have a greater mass than beta particles (which are electrons or positrons). In an electric field, the force experienced by a charged particle is proportional to its charge and inversely proportional to its mass. Although alpha particles have a larger charge, their greater mass means they are less affected by the electric field compared to beta particles. Therefore, this statement is **false**.

### Summary of True Statements:
- **Statement B**: True
- **Statement C**: True

### Final Answer:
The correct options are **B and C**.