Across
- 3. far, 118 elements have been discovered. Gold is an element made up of only gold atoms.
- 4. Able to be hammered or pressed into shape without breaking
- 6. formula A symbol that shows the chemical composition of a substance
- 8. A substance made up of two or more types of atom bonded together
- 9. has the atomic number 6 and is followed in the periodic table by nitrogen (7) and oxygen (8).
- 12. A repeating arrangement of atoms in a solid
- 15. metals are located in the first group of the periodic table.
- 18. are broken or formed during chemical reactions.
- 19. The smallest particle of an element
- 20. Easily broken
- 21. the number by which elements are ordered in the periodic table
- 22. metal rhenium is the element with the highest known boiling point, 5590°C!
- 23. general, metals have higher melting points than non-metals.
- 24. chemicalformula for water shows that it has 2 hydrogen atoms for each oxygen atom.
- 25. The temperature at which a substance changes from solid to liquid
- 26. in the same group have similar properties. Atomic number increases from top to bottom.
- 27. is a compound with molecules made of one oxygen atom bonded to two hydrogen atoms.
Down
- 1. One or two letters used to represent an element
- 2. The temperature at which a substance changes from liquid to gas
- 5. symbols for some elements come from Latin, such as Au for gold, from the Latin word 'aurum'.
- 7. non-metal elements are brittle, breaking easily when hit.
- 8. bond An attractive force that holds two atoms together
- 10. A soft, shiny metal that is highly reactive
- 11. and oxygen gases chemically react to form a new substance, water.
- 13. The re-arrangement of atoms to form one or more new substances
- 14. A substance made up of only one type of atom
- 16. metals are malleable, allowing them to be hammered into thin sheets.
- 17. are highly ordered structures held together by bonds between atoms.
- 21. atom is made up of even smaller “subatomic” particles.