5 Written questions
5 Matching questions
- subatomic particles
- free radical
- mass number
- radioactive isotopes (radioisotopes)
- electrons (e⁻)
- a Unstable isotopes; their nuclei decay into a stable configuration over time, emitting radiation as they do so, and transform into a different element; the time span of the change is anywhere from a fraction of a second to millions of years, depending on the isotope.
- b An atom or group of atoms with an unpaired electron in the outermost shell; makes the atom unstable, highly reactive, and destructive to nearby molecules.
- c Negatively charged particles located in a cloud, moving about the nucleus of an atom.
- d The dozens of particles that compose atoms, namely protons, neutrons, and electrons.
- e The sum of an atom's protons and neutrons.
5 Multiple choice questions
- The science of the structure and interactions of matter.
- The number of protons in an atom.
- The regions outside the nucleus that electrons move about in; depicted as simple circles around the nucleus; each region holds a specific number of electrons (2.8.18).
- The building blocks of all forms of matter -- both living and nonliving; cannot be split into a simpler substance by ordinary chemical means.
- The process of giving up or gaining electrons.
5 True/False questions
atoms → The smallest units of matter that retain the properties and characteristics of the elements.
trace elements → Calcium, Phosphorous, Potassium, Sulfur, Sodium, Chlorine, Magnesium, and Iron; make up about 3.6% of the body's mass.
tracers → Radioisotopes used to follow movements of certain substances through the body.
lesser elements → The elements that make up the last .4% of the mass of the body.
antioxidants → Substances that inactivate oxygen-derived free radicals.