State the law of chemical equivalent.

Law of Chemical Equivalence states that in any chemical reaction the equivalents of all the reactants and products must be same.

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.