Answer to Question #71886 in General Chemistry for Rhman

Question

The atomic number increase in both situation either if you move down a group or you move across so as the energy levels increases.

so, how would the atomic radius decreases if the atomic number increasing ?

Answer 1

Answer:
As atomic numbers increase, the number of protons increases as well in the nucleus. This concentration of positive charge in the middle of an atom makes all the electrons come closer to the nucleus. Thus, the radius of the atom decreases because the electron cloud is less spread out.