Answer:J.J. Thomson, he was using a high-vacuum cathode-ray tube
Explanation:(I Googled it)
The highest electronegativity is in the elements in the top left corner of the periodic table, and the lowest in the bottom right corner. Therefore, traveling up or to the left across the periodic table will increase the electronegativity
Answer:
A.The potential energy increases because the charges have a greater repulsion.
Explanation: Thanks to Mwilliams55513 for the help :}