Scientists have changed the model of the atom as they have gathered new evidence. One of the atomic models

is shown below. what experimental evidence led to the development of this atomic model from the one before it?

where's the diagram?

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

4d^55s^1 ( third choice)