Across
- 7. a substance that does not contain carbon or only has single carbon atoms
- 10. a physical change in the visible structure of the matter without changing the molecular or unit structure
- 11. is a molecule that contains two or more different elements which have chemically combined
- 14. an ion with a positive electrical charge
- 17. a mixture with uniform distribution of particles throughout the sample
- 18. the number of protons in the nucleus of each atom of the element
- 19. a neutral particle in the nucleus of an atom
- 22. the force that holds two or more atoms together
- 23. the outermost electron of an atom that participates in chemical bonding
- 25. the central core of the atom containing protons and neutrons
- 26. a starting substance in a chemical reaction
- 27. a mixture with nonuniform distribution of particles throughout the sample
- 28. the rows in the periodic table which are often numbered top to bottom from 1 to 7
- 29. a combination of symbols of the elements that make up a compound and represent one molecule or unit of a compound
Down
- 1. a substance produced by a chemical reaction
- 2. the scientific principle stating that matter can be changed but not created or destroyed
- 3. the chemical bond formed when atoms share one or more pairs of valence electrons
- 4. the columns in the periodic table which are often numbered left to right from 1 to 18
- 5. an atom or group of atoms that has a positive or negative electrical charge because it has gained or lost electrons
- 6. an ion with a negative electrical charge
- 7. the chemical bond in which the electrons are transferred from one atom to another, causing both atoms to have a charge and be attracted to each other
- 8. the sum of the number of protons and neutrons in an atom
- 9. a positively charged particle in the nucleus of an atom
- 10. an alteration in shape, physical state, size, or temperature without a change in the chemical identity
- 12. a change occurring when atoms of one or more substances rearrange to form one or more new substances with different chemical and physical properties
- 13. a negatively charged particle that occupies the space in an atom outside the nucleus
- 15. the smallest unit of any elemental substance that maintains the characteristics of that substance
- 16. a substance containing chains or rings of carbon
- 20. two or more atoms of the same element that combine chemically; the basic unit of any compound
- 21. a substance that contains only one kind of atom
- 24. when two atoms stare two pairs of electrons
- 30. substances that are put together but are not chemically combined