Correct statements for an element with atomic number \( 9 \) are:
A. There can be \( 5 \) electrons for which \( m_s = +\frac{1}{2} \) and \( 4 \) electrons for which \( m_s = -\frac{1}{2} \).
B. There is only one electron in \( p_z \) orbital.
C. The last electron goes to orbital with \( n = 2 \) and \( l = 1 \).
D. The sum of angular nodes of all the atomic orbitals is \( 1 \).
Choose the correct answer from the options given below:
