5 Written Questions
5 Matching Questions
- molecular formula
- Calcium, Phosphorous, Sulfur, Potassium, Sodium, Chlorine, Magnesium, and Iron
- subatomic particles
- Carbon, Hydrogen, Oxygen, and Nitrogen
- a Atoms of an element that have different numbers of neutrons and therefore different mass numbers; most of them are stable and do not change over time.
- b The four major elements in the human body.
- c The eight lesser elements in the human body.
- d The dozens of particles that compose atoms, namely protons, neutrons, and electrons.
- e Indicates the elements and the number of atoms of each element that make up a molecule.
5 Multiple Choice Questions
- Uncharged (neutral) particles located within the nucleus of an atom.
- Substances that inactivate oxygen-derived free radicals.
- Calcium, Phosphorous, Potassium, Sulfur, Sodium, Chlorine, Magnesium, and Iron; make up about 3.6% of the body's mass.
- The number of protons in an atom.
- Anything that occupies space and has mass.
5 True/False Questions
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.
atomic mass (atomic weight) → The standardized unit of measurement for the mass of atoms and their subatomic particles.
trace elements → Calcium, Phosphorous, Potassium, Sulfur, Sodium, Chlorine, Magnesium, and Iron; make up about 3.6% of the body's mass.
compound → Two or more atoms sharing electrons.
electron shells → Negatively charged particles located in a cloud, moving about the nucleus of an atom.