5 Written Questions
5 Matching Questions
- mass number
- neutrons (n⁰)
- electron shells
- 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 Uncharged (neutral) particles located within the nucleus of an atom.
- d 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).
- e A substance that contains atoms of two or more different elements.
5 Multiple Choice Questions
- Two or more atoms sharing electrons.
- The dozens of particles that compose atoms, namely protons, neutrons, and electrons.
- The average mass of all of an atom's naturally occurring isotopes.
- 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 science of the structure and interactions of matter.
5 True/False Questions
chemical elements → The elements that make up the last .4% of the mass of the body.
atomic number → The sum of an atom's protons and neutrons.
protons (p⁺) → Positively charged particles located within the nucleus of an atom.
trace elements → Carbon, Hydrogen, Oxygen, and Nitrogen; they alone make up about 96% of the body's mass.
matter → Anything that occupies space and has mass.