Across
- 1. An atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
- 5. Negative charge.
- 7. Positive charge.
- 8. No charge.
Down
- 1. 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.
- 2. is a column of elements in the periodic table.
- 3. the name given to a horizontal row of the periodic table.
- 4. table a table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure (and hence similar chemical properties) appear in vertical columns.
- 6. Mass he masses of an atom of a chemical element expressed in atomic mass units.