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6-4
Atoms, Elements and the Periodic Table
| Question | Answer |
|---|---|
| anything that has mass and takes up space | matter |
| a small particle that makes up most types of matter | atom |
| a law that states that matter is not created or destroyed - it only changes form | law of conservation of matter |
| negatively charged particles in an atom | electrons |
| scientist credited with discovering the electron | J.J. Thomson |
| positively charged central part of the atom | nucleus |
| particles in the nucleus with a positive charge | protons |
| particles in the nucleus with no charge | neutrons |
| matter made of only one kind of atom | element |
| atoms of the same element that have different numbers of neutrons | isotopes |
| the number of protons plus the number of neutrons | mass number |
| the weighted average mass of the isotopes of an element | atomic mass |
| kinds of elements that generally have shiny, or metallic luster | metals |
| elements that are usually dull in appearance | nonmetals |
| elements that have characteristics of metals and nonmetals | metalloids |
| matter that has the same composition and properties throughout is called a | substance |
| a substance whose smallest unit is made up of atoms of more than one element bonded together | compound |
| two or more substances that together but don't combine to make a new substance | mixture |
| a mixture that is the same throughout | homogeneous |
| a mixture that has larger parts that are different from each other | heterogenous |
Created by:
mrsgrom
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