Answer:
The electronegativity values from lowest to highest are: Potassium, Lithium, Selenium, Oxygen. In the periodic table, electronegativity generally increases from left to right across a period and decreases from top to bottom within a group. This is because as you move from left to right, the number of protons increases, which increases the positive charge of the nucleus and attracts electrons more strongly. As you move down a group, the number of energy levels increases, which increases the distance between the nucleus and the valence electrons, reducing the attraction.
Step-by-step explanation: