1. Check statement (A): Electronic configuration of Cr

Chromium has atomic number $24$.

Its expected configuration by simple Aufbau filling would be: $[Ar]\,3d^4 4s^2$ But chromium is an exception due to extra stability of half-filled $d$-subshell: $[Ar]\,3d^5 4s^1$ So, (A) is correct.

2. Check statement (B): Magnetic quantum number may have a negative value

The magnetic quantum number $m_l$ can take values: $m_l = -l, -(l-1), \dots, 0, \dots, +(l-1), +l$ Hence it can definitely be negative.

So, (B) is correct.

3. Check statement (C): In ground state, orbitals are filled in order of increasing energies

This is the Aufbau principle: in the ground state, electrons occupy orbitals in order of increasing energy.

So, (C) is correct.

4. Check statement (D): Total number of nodes are given by $n-2$

For an orbital:

• Total number of nodes $= n-1$
• Angular nodes $= l$
• Radial nodes $= n-l-1$

Thus total nodes are: $l + (n-l-1) = n-1$ So statement (D) saying total nodes are $n-2$ is incorrect.

5. Conclusion

Correct statements are: $\text{(A), (B), and (C)}$

Therefore, the correct option is: $\boxed{\text{D}}$