1A, 3B, and 7A are examples of what on the periodic table?

clouds form

solid ice forms on leaves.

water droplets form on grass.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.