Across
- 3. Carbon dioxide.
- 7. They are all shiny, good conductors of electricity and heat and ost of them are solids.
- 8. Is a metalloid,its chemical element has a symbol Si.
- 9. Its symbol is N in the periodic table of elements.
- 11. First element in the periodic table.
- 12. Salt is a _________.
- 14. It is ubicated in the left side of the periodic table.
- 18. share characteristics of both metals and non-metals and are also called semimetals, they are semi-conductors, which means that they both envelop and conduct electricity.
- 19. Is essential to human life, it is found in the air we breathe and the water we drink.
Down
- 1. Water.
- 2. Is a substance made up of atoms which all have the same number of protons.
- 3. It is a non-metal and a very good conductor or electricity.
- 4. Is a colorless, tasteless and unsmelling gas.
- 5. They do not conduct heat or electricity very well but have the ability to gain electrons very easily, they are usually brittle and are not easily molded into shapes.
- 6. Are made up of atoms that are held together by chemical bonds.
- 10. they are also called inert gases, this group consists in helium, neon, argon, krypton, xenon, and radon.
- 13. Chlorine.
- 14. It consists of a nucleus, which has a positive charge, and electrons that move around the nucleus.
- 15. potassium.
- 16. Is an excellent conductor of heat and electricity. It is a soft, yellow, metal with a beautiful brillance.
- 17. Is a material system made up of two or more different substances which are mixed but are not chemically bonded together.