Crossword: The Periodic Table

2. The number of protons in the nucleus; determines the identity of the element.
3. A noble gas with two protons; used in balloons.
4. A transition metal essential for blood; symbol is Fe.
11. Found in all living things; has many forms including graphite and diamond.
13. A horizontal row of elements with the same number of electron shells.
15. Essential for respiration; makes up about 21% of Earth's atmosphere. Has 8 protons.
16. Rare earth metals near the bottom of the table
17. Elements that are malleable, ductile, and have good conductivity.
18. A physical property of metals that allows them to be shaped easily
19. A physical property of metals that allows them to be stretched into wires.
21. Soft metals that are very reactive and have one valence electron
22. Found on the left side of the stair-case. Good conductors.
23. A vertical column on the Periodic Table
25. An alkaline earth metal found in bones and teeth.
27. Bottom row of the periodic table; includes mostly radioactive elements.
28. The only metal that is liquid at room temperature; symbol is Hg.
29. Russian scientist who arranged elements by atomic mass and predicted new ones.

1. A substance that allows heat or electricity to flow easily
5. Elements that do not react easily.
6. Elements with properties of both metals and nonmetals; found near the stair-step line.
7. The most reactive halogen; used in toothpaste to prevent tooth decay
8. The tendency of an atom to pull electrons toward itself in a bond.
9. The electrons in the outermost energy level
10. Used in batteries. Can be cut with a butter knife.
12. Poor conductors; often gases or brittle solids on the right side of the stair-case.
14. Elements that have 2 valence electrons and are metals
20. The lightest and most abundant element in the universe
24. Very reactive nonmetals that form salts with metals.
26. Has the chemical symbol Au.