What effect does the addition of a catalyst have on a chemical reaction at equilibrium?

Afamily is one another name for a group on the table of elements.

Is a pencil falling to the floor anon contact force, a force, or a contact force

Element j is 1s 2s 2p 3s . (i) how many unpaired electrons does j have? (ii) is j a good oxidizing agent or a reducing agent? (iii) state reason for the answer.