The accepted model of the atom was changed. JJ Thomson discovered the electrons and performed experiment using the cathode ray tube. The model before his did not have electrons so the model was changed. Hope this helps
Answer:
Because the force proton exerts is stronger than shielding effect, the atomic size decreases and electronegativity and ionization energy increases.
Answer:
You would use the second formula! you can tell because you have an initial volume and a second volume (after blowing it up).
