State a negative side effect of nuclear decay

Hey can you me with this i really need y’all

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

Connect the whole numbers on the periodic table to indicate what they represent?