The diagram above shows the repeating groups of atoms that make up two samples. Will the properties of the two samples likely be the same or different?
(Examples of properties are smell, color, and the temperature at which a
substance melts.)

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.

the answer is b. dilution