5 Written questions
5 Matching questions
- radioactive isotopes (radioisotopes)
- mass number
- 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 The sum of an atom's protons and neutrons.
- c The science of the structure and interactions of matter.
- d The smallest units of matter that retain the properties and characteristics of the elements.
- e Radioisotopes used to follow movements of certain substances through the body.
5 Multiple choice questions
- The average mass of all of an atom's naturally occurring isotopes.
- The dense central core of an atom where protons and neutrons are located.
- The dozens of particles that compose atoms, namely protons, neutrons, and electrons.
- 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 time required for half of the radioactive atoms in a sample of an isotope to decay into a more stable form.
5 True/False questions
molecular formula → Two or more atoms sharing electrons.
major elements → Carbon, Hydrogen, Oxygen, and Nitrogen; they alone make up about 96% of the body's mass.
Calcium, Phosphorous, Sulfur, Potassium, Sodium, Chlorine, Magnesium, and Iron → The four major elements in the human body.
neutrons (n⁰) → Uncharged (neutral) particles located within the nucleus of an atom.
isotopes → The smallest units of matter that retain the properties and characteristics of the elements.