What is a double bond? a. two covalent bonds between adjacent atoms in a molecule b. a total of two covalent bonds between molecules c. a total of two covalent bonds in a molecule d. two covalent bonds between adjacent molecules ( answer quickly. you in advance.)

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

Explanation for basic character?

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.