Question

why is cesium bigger than elemented sodium​

Answer 1

the valence electron in both atoms feels a similar pull from the nucleus, but the valence electron in the cesium atom is further from the nucleus because it is in a higher energy level. ... Consequently, the size of a cesium atom is larger than that of a sodium atom.Feb 23, 2012

Answer 2

Explanation:

However, the closure of a valence orbital can make a huge difference. Thus, an atom of cesium is larger than an atom of sodium, but an atom of chlorine is actually smaller than the sodium atom.