Which describes where fog forms

Frozen dew forms when air cools to the dew point, and dew forms, and then the air temperature drops below freezing, freezing the dew droplets. Fog is when the visibility of the air drops to less than 1km, and the air is wet with tiny floating water droplets, as a cloud resting near the ground.

Explanation:

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.