5 Written Questions
5 Matching Questions
- 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 dozens of particles that compose atoms, namely protons, neutrons, and electrons.
- c The four major elements in the human body.
- d The amount of matter in any object; never changes.
- e An atom that has a positive or negative charge because it has unequal numbers of protons and electrons.
5 Multiple Choice Questions
- The smallest units of matter that retain the properties and characteristics of the elements.
- The average mass of all of an atom's naturally occurring isotopes.
- 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).
- 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.
- The process of giving up or gaining electrons.
5 True/False Questions
trace elements → The elements that make up the last .4% of the mass of the body.
mass number → The sum of an atom's protons and neutrons.
half-life → The time required for half of the radioactive atoms in a sample of an isotope to decay into a more stable form.
atomic number → The sum of an atom's protons and neutrons.
free radical → Radioisotopes used to follow movements of certain substances through the body.