When exposed to air, sodium forms a white oxide chemical or physical property?

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

If a particle has z = 25 and 23 electrons, what is its charge?

Name 3 types of energy you see being used as you look around a classroom