Match Each of the Following Elements to Its Description

Match each of the following elements to its description.
-Oxygen (O)

A) This element has 5 valence electrons and is a poison that can be found in drinking water.
B) Having 8 protons, this element is essential for life.
C) One of the only elements to exist as a liquid at room temperature, this is a dangerous environmental toxin that accumulates in fish.
D) This element loses 2 electrons to form a +7 ion; not consuming enough of it can increase risk of osteoporosis.
E) This element gains three electrons when forming an ion; it also helps form an essential source of energy for cells.
F) This is one of the transition elements, and is essential for the function of the protein hemoglobin.