Across
- 3. horizontal rows
- 5. two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nucleus
- 6. an element whose properties are intermediate between those of metals and solid nonmetals or semiconductors.
- 9. are very reactive chemical species which readily lose their one valence electron to form ionic compounds with nonmetals
- 10. a chemical element that mostly lacks metallic attributes
Down
- 1. reactive nonmetallic elements that form strongly acidic compounds with hydrogen from which simple salts can be made
- 2. a table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure
- 4. elements in a column
- 7. make up a group of chemical elements with similar properties; under standard conditions, they are all odorless, colorless, monatomic gases with very low chemical reactivity.
- 8. the mass of an atom of a chemical element that is expressed in units and is approximately equivalent to the number of protons and neutrons in the atom and is the average number of the different isotopes in the atom