(A) 3

(B) 2

(C) 1

(D) 4

Correct Answer: 1

Number of radial nodes is given by the formula:

Radial nodes = n − l − 1

For 3p orbital:

• Principal quantum number (n) = 3
• Azimuthal quantum number (l) for p-orbital = 1

Radial nodes = 3 − 1 − 1 = 1

Hence, the number of radial nodes in 3p orbital is 1.