Chemistry Crossword

1. number of protons in the nucleus of one atom of an element.
4. dull,brittle element that does not conduct electricity.
6. a table in which the elements are organized by their physical and chemical properties.
7. change that results when two or more substances react.
9. chemical combination of two or more elements in a specific ratio.
11. group 2 elements in the periodic table; not including hydrogen; there reactivity is not as strong as alkaline metals.
15. a substance that is made of only one kind of matter.
16. orbit of electrons around the nucleus of an atom.
18. pure substance that cannot be broken down into other substances.
19. positively charged particle in the nucleus of an atom.
20. group 18 elements in the periodic table; the most stable and unreactive material.
22. neutral particle in the nucleus of an atom.
23. homogeneous mixture; mixture of two or more pure substances that looks like one substance.

2. shiny, malleable, ductile element that conducts electricity.
3. the point in temperature that an element starts to melt.
5. heterogeneous mixture; mixture in which the different substances that make up the mixture are visible.
7. cloudy mixture in which tiny particles of one substance are held in another and cannot be separated
8. elements that has both metallic and nonmetallic properties.
10. change in appearance or state of a substance that does not change composition.
12. The smallest part of an element.
13. mass of one atom of an element calculated from the total number of protons,neutrons, and electrons of that atom; measured in atomic mass units (amu).
14. the point in temperature that an element starts to boil.
16. invisible negatively charged particle that orbits the nucleus of an atom.
17. cloudy mixture in which tiny particles of one substance are held in another and can be separated.
21. combination of pure substances; unlike a compound.