A parent nucleus decays by emitting a gamma photon, e. g., Tc-99m decays to Tc-99g. Parent and daughter nuclei are: a) isotopes b) isotones c) isobars d) isomers e) combination of 2 or more of the above

12. complete each of the following word equations for synthesis reactions. a. sodium + oxygen -> b. magnesium + fluorine -> 13. complete and balance the equations for the decomposition reactions. a. hgo -> [with the triangle heat symbol above the arrow] b. h2o(l) -> [with "electricity" written above the arrow]

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

Select all of the statements which are true. electrons are located in shells or orbits around the atom. electrons orbit slowly around the atom. electrons travel in one flat path around the nucleus of an atom. the valence of an atom is determined by the number of electrons in the atom's outermost shell.