The nucleus of a promethium-145 atom contains 61 protons. Assume that the nucleus is a sphere with radius 5.69 fm and with the charge of the protons uniformly spread through the sphere. At the nucleus surface, what are the magnitude and direction of the electric field produced by the protons?

When svante arrhenius first proposed his acid-base theory, he was a doctoral candidate. his professors thought his ideas were unfounded. within a decade, the arrhenius theory of acid-base was widely accepted and praised within the scientific world. arrhenius defined acids as compounds having ionizable hydrogen and bases as compounds with ionizable a) barium. b) hydronium. c) hydroxide. d) oxygen.

What is a possible quantum number set for an electron in the 3s orbital of a magnesium atom

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