The subshell that arlses after f subshell is called g subshell then the correct statement (s) regarding g subshell is/are
(a) it contains 16electrons and 8 orbitals,
(b) corresponds to l= 4 and first occur in 5th energy level,
(c) a g orbital can have maximum of two electrons
(d) 5f subshell has higher energy than 5g subshell

Options

A. Only (a)
B. (b) & (c)
C. Only (b)
D. (b), (c) & (d)

Answer

To solve the question regarding the g subshell, we will analyze each statement one by one based on our knowledge of quantum mechanics and electron configuration.

### Step-by-Step Solution:

1. **Understanding the g subshell**:
- The g subshell arises after the f subshell in the sequence of subshells.
- The azimuthal quantum number (l) for the g subshell is 4.

2. **Analyzing Statement (a)**:
- The statement claims that the g subshell contains 16 electrons and 8 orbitals.
- For any subshell, the number of orbitals is given by the possible values of the magnetic quantum number (m_l), which ranges from -l to +l.
- For l = 4 (g subshell), the possible values of m_l are -4, -3, -2, -1, 0, +1, +2, +3, +4, totaling **9 orbitals**.
- Each orbital can hold a maximum of 2 electrons, so the total number of electrons in the g subshell is 9 orbitals × 2 electrons/orbital = **18 electrons**.
- Therefore, **Statement (a) is incorrect**.

3. **Analyzing Statement (b)**:
- The statement claims that the g subshell corresponds to l = 4 and first occurs in the 5th energy level.
- For the principal quantum number n = 5, the possible values of l are 0, 1, 2, 3, and 4, which correspond to s, p, d, f, and g subshells respectively.
- Thus, the g subshell does indeed first occur in the 5th energy level.
- Therefore, **Statement (b) is correct**.

4. **Analyzing Statement (c)**:
- The statement claims that a g orbital can have a maximum of 2 electrons.
- According to the Pauli Exclusion Principle, each orbital can hold a maximum of 2 electrons regardless of the subshell type.
- Therefore, **Statement (c) is correct**.

5. **Analyzing Statement (d)**:
- The statement claims that the 5f subshell has higher energy than the 5g subshell.
- To determine the energy levels, we apply the n + l rule, where n is the principal quantum number and l is the azimuthal quantum number.
- For 5f: n + l = 5 + 3 = 8.
- For 5g: n + l = 5 + 4 = 9.
- Since the 5g subshell has a higher n + l value, it has higher energy than the 5f subshell.
- Therefore, **Statement (d) is incorrect**.

### Conclusion:
The correct statements regarding the g subshell are **(b) and (c)**.