| Question | Answer |
|---|---|
| alkalis | bases that dissolve in water |
| atom | smallest piece of an element |
| atomic mass | sum of protons and neutrons |
| atomic number | number of protons in an atom’s nucleus |
| atomic theory | scientists ideas about atoms |
| chemical change | another name for a chemical reaction |
| chemical reaction | This occurs when molecules combine to create a new substance. |
| chemical symbols | abbreviations for elements |
| chemistry | study of matter |
| compound | molecules produced by a reaction |
| element | substance containing only one kind of atom |
| group | vertical columns of table |
| indicator | changes color when exposed to acid or base |
| ion | atom that has gained or lost an electron |
| molecule | atoms joined together |
| neutral | pH of 7.0 |
| particle accelerator | atom smasher |
| period | horizontal rows of periodic table |
| pH scale | “power of hydrogen”; numbered from 0-14 |
| stable | When an atom's outermost shell is completely full so the shell is closed. |
