## Chemistry: The Central Science (13th Edition)

The number of nodes in $2p_x$ orbital is 1 and in $3s$ orbital is 2.
*The $2p_x$ orbital: Every $2p$ orbital is dumbbell-shaped, with electron density being concentrated on two regions on either side of the nucleus and separated by a node at the nucleus. Therefore, the $2p_x$ has 1 node at the nucleus. *The $3s$ orbital: The number of nodes for an $ns$ orbital is equal to $n-1$. Therefore, the number of nodes in an $3s$ orbital is $2$.