Which of the following terms best describes the nucleus of a radioactive element?
a. unchanging
b. explosive
c. unstable
d. energized

Noble gases are the most reactive elements on the periodic table. a. true b. false

If a plot weight (in g) vs. volume (in ml) for a metal gave the equation y= 13.41x and r^2=0.9981 what is the density of the metal?

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?