5 Written questions
5 Matching questions
- electrons (e⁻)
- Carbon, Hydrogen, Oxygen, and Nitrogen
- free radical
- radioactive isotopes (radioisotopes)
- a The four major elements in the human body.
- b The process of giving up or gaining electrons.
- c Negatively charged particles located in a cloud, moving about the nucleus of an atom.
- d 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.
- e 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.
5 Multiple choice questions
- The elements that make up the last .4% of the mass of the body.
- 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.
- Anything that occupies space and has mass.
- The time required for half of the radioactive atoms in a sample of an isotope to decay into a more stable form.
- The smallest units of matter that retain the properties and characteristics of the elements.
5 True/False questions
major elements → Carbon, Hydrogen, Oxygen, and Nitrogen; they alone make up about 96% of the body's mass.
protons (p⁺) → Positively charged particles located within the nucleus of an atom.
atomic mass (atomic weight) → The average mass of all of an atom's naturally occurring isotopes.
electron shells → Negatively charged particles located in a cloud, moving about the nucleus of an atom.
chemical elements → Carbon, Hydrogen, Oxygen, and Nitrogen; they alone make up about 96% of the body's mass.