Question

number of nodal planes in antibonding pi 2 px orbital

Answer 1

The anti-bonding sigma p orbitals have three nodal planes. The sigma p bonding orbital is the lowest energy orbital which means it will have zero nodes. Then there is the pi bonding orbitals (1 node), the pi anti-bonding orbitals (2 nodes) and finally the anti-bonding sigma p orbital which has three nodes.

This is an MO diagram of HX (X being a halogen). As you go up in energy the number of nodes increases. Just remember that the p orbital has a node in the center so include that when you are counting the number of nodes.

Answer 2

Hii friend ,

The answer is probably 1.
because three are the nodal 2p xy ,2p yz, and 2p xz.

and each of them are represent the axis other than the the letters.

I mean for 2p x orbital the nodal plane is "YZ" plane.

Hope this helps you a little!!!!