Across
- 2. the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
- 3. a horizontal row of the periodic table.
- 6. any of numerous subatomic constituents of the physical world that interact with each other, including electrons, neutrinos, photons, and alpha particles.
- 7. a column in the periodic table of the chemical elements.
- 8. the electrons encircle the nucleus of the atom in specific allowable paths called orbits.
Down
- 1. a model used to describe the structure and makeup of an atom.
- 4. each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
- 5. the total number of protons and neutrons in a nucleus.