5 Written questions
5 Matching questions
- free radical
- electrons (e⁻)
- mass number
- chemical symbol
- a The smallest units of matter that retain the properties and characteristics of the elements.
- b The sum of an atom's protons and neutrons.
- c 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.
- d Negatively charged particles located in a cloud, moving about the nucleus of an atom.
- e One or two letters of an element's name in English, Latin, or another language (ex. H for Hydrogen, Ne for Neon, or K for Potassium).
5 Multiple choice questions
- The eight lesser elements in the human body.
- Positively charged particles located within the nucleus of an atom.
- The average mass of all of an atom's naturally occurring isotopes.
- Substances that inactivate oxygen-derived free radicals.
- The dozens of particles that compose atoms, namely protons, neutrons, and electrons.
5 True/False questions
half-life → The time required for half of the radioactive atoms in a sample of an isotope to decay into a more stable form.
tracers → Radioisotopes used to follow movements of certain substances through the body.
radioactive isotopes (radioisotopes) → 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.
trace elements → Calcium, Phosphorous, Potassium, Sulfur, Sodium, Chlorine, Magnesium, and Iron; make up about 3.6% of the body's mass.
molecule → Two or more atoms sharing electrons.