How many protons are in the radioactive isotope 40/19k

Quiz1. which physical state of nitrogen has the highest entropy? a solid© b gasoc liquid

Draw a line graph showing the relationship between temperature in kelvin as a function of kinetic energy.

The comparison of the number of atoms in a copper coin the size of a penny with the number of people on earth is made to illustrate which of the following? a. that atoms are indivisible b. that atoms are very small c. that atoms are very large d. that in a copper penny, there is one atom for every person on earth