Question: How can radiation be controlled and safely used in medicine?

Answer: Apply radiation to specific parts of the body at controlled doses.

Question: ________ is an example of an element.

Answer: Nitrogen

Question: What are the four most common elements found in living organisms?

Answer: carbon, oxygen, nitrogen, and hydrogen

Question: Which of the following elements is a trace element that is essential to life?

Answer: Iron

Question: In order to have a positive charge, an atom must have ________

Answer: more protons than electrons

Question: Isotopes of an element have the same number of ________ and different numbers of________.

Answer: protons; neutrons

Question: An atom with an electrical charge is a(n)

Answer: ion

Question: What name is given to bonds that involve the sharing of electrons?

Answer: covalent

Question: How many oxygen atoms are in the products of the following reaction?

C6H12O6+ 6 H2O+ 6 O2 6 CO2+ 12 H2O

Answer: 24

Question: What are the reactant(s) in the followingchemical reaction?C6H12O6+ 6 H2O+ 6 O2 6 CO2+ 12 H2O

Answer: C6H12O6, H2O, and O2