5 Written Questions
5 Matching Questions
- subatomic particles
- electron shells
- mass number
- a The dozens of particles that compose atoms, namely protons, neutrons, and electrons.
- b The time required for half of the radioactive atoms in a sample of an isotope to decay into a more stable form.
- c 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).
- d The sum of an atom's protons and neutrons.
- e The amount of matter in any object; never changes.
5 Multiple Choice Questions
- Indicates the elements and the number of atoms of each element that make up a molecule.
- Negatively charged particles located in a cloud, moving about the nucleus of an atom.
- The four major elements in the human body.
- The standardized unit of measurement for the mass of atoms and their subatomic particles.
- 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).
5 True/False Questions
tracers → The smallest units of matter that retain the properties and characteristics of the elements.
trace elements → The elements that make up the last .4% of the mass of the body.
molecule → A substance that contains atoms of two or more different elements.
compound → An atom that has a positive or negative charge because it has unequal numbers of protons and electrons.
nucleus → The dense central core of an atom where protons and neutrons are located.