Atoms and the Periodic Table Crossword Puzzle

1. Elements that are poor conductors of heat and electric current. Located on right of periodic table.
3. A negatively charged ion; gained valence electrons.
7. An atom or group of atoms that has a positive or negative charge because they lost or gained electrons.
9. 1-2 electrons in the outer energy level, less reactive than alkali-earth metals, shiny, good conductor of thermal energy and electrical current, high density.
13. level a region of an atom in which electrons of the same energy are likely to be found; represented by periods on periodic table
15. earth metals metallic elements in group 2 of the periodic table which are harder than the alkali metals and are also less reactive.
16. Atoms of the same element that have different numbers of neutrons; different atomic mass.
17. electrons Electrons on the outermost energy level of an atom; involved in ion formation and chemical bonding..
19. A positively charged ion; lost valence electrons.

2. elements elements with atomic numbers greater than 92.
4. The amount of energy required to remove an electron from an atom.
5. nonmetals, 8 electrons in outer shell, nonreactive, useful for things because they are nonreactive, colorless, odorless.
6. The 14 elements with atomic numbers from 58 to 71.
8. table A chart of the elements showing the repeating pattern of their properties.
10. configuration the arrangement of electrons in the orbitals of an atom.
11. the 14 elements with atomic numbers from 90 to 103.
12. elements on the periodic table that have properties of both metals and nonmetals.
14. Contains nonmetals, 7 valence electrons in it's outermost energy level. Very reactive.
18. Basic unit of matter
20. radius a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding cloud of electrons.