Question

Arrange the following atoms in order of increasing effective nuclear charge experienced by the electrons in the n=3 electron shell: K, Mg, P, Rh, and Ti. Explain the basis for your order.

Answer 1

 I think that the effective nuclear charge increases as you go up a group and across a period. 

so maybe Rh, K, Ti, Mg, P 

 I hope I helped :)