Imagine that you are studying astronomy in college and the time has come to choose a more specific path for your studies—which path do you think would be most interesting to you: Aeronautics, Meteorology, Aerospace Engineering, Chemistry, Physics, Geology, or something else? Discuss and explain your choice.

There are main groups in the modern periodic table of elements

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.