chemistry crossword

3. shiny, malleable, ductile element that conducts electricity.
4. elements that has both metallic and nonmetallic properties.
5. change that results when two or more substances react.
7. group 2 elements in the periodic table; not including hydrogen; there reactivity is not as strong as alkaline metals.
10. The smallest part of an element.
11. group 18 elements in the periodic table; the most stable and unreactive material.
14. pure substance that cannot be broken down into other substances.
15. homogeneous mixture; mixture of two or more pure substances that looks like one substance.
16. change in appearance or state of a substance that does not change composition.
18. cloudy mixture in which tiny particles of one substance are held in another and can be separated.
20. chemical combination of two or more elements in a specific ratio.
21. positively charged particle in the nucleus of an atom.
22. neutral particle in the nucleus of an atom.
23. the point in temperature that an element starts to boil.
24. the point in temperature that an element starts to melt.

1. combination of pure substances; unlike a compound.
2. a substance that is made of only one kind of matter.
4. heterogeneous mixture; mixture in which the different substances that make up the mixture are visible.
6. 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).
8. orbit of electrons around the nucleus of an atom.
9. number of protons in the nucleus of one atom of an element.
12. a table in which the elements are organized by their physical and chemical properties.
13. cloudy mixture in which tiny particles of one substance are held in another and cannot be separated
17. invisible negatively charged particle that orbits the nucleus of an atom.
19. dull,brittle element that does not conduct electricity.