Which statement describes a system that consists of sugar crystals dissolving in water?
the system becomes more ordered and has an increase in entropy.
the system becomes more ordered and has a decrease in entropy.
the system becomes more disordered and has an increase in entropy.
the system becomes more disordered and has a decrease in entropy.

To know the answer, you either know what is really the nature and chemistry of a sugar solution. You can also know the answer by knowing the meaning of entropy. Entropy is often interpreted as the degree of disorder or randomness in the system. So the correct statement is that the system becomes more disordered and has an increase in entropy.

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.

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.