Answer:
coffee is a homogeneous mixture while water is a heterogeneous mixture
Answer:
It has 4 valence electrons
Explanation:
Tin atoms have 50 electrons and 50 protons with 4 valence electrons in the outer shell.
<span>When fracking liquid waste is left in pools on the surface, Toxic Waste or Toxic Chemicals can evaporate into the air and contribute to pollution. </span><span>A new study shows that these spills have left surface waters in the area carrying radium, selenium, thallium, lead, and other toxic chemicals that can continue for years at unsafe levels. </span>
