Science: Elements and Compounds Vocabulary
1. atom- the smallest unit of an element that still has the
properties of that element
2. proton - particle with a positive charge
3. electron – particle with a negative charge
4. neutron- particle with no charge
5. atomic number- total number of protons in a nucleus
6. periodic table- table that shows the elements arranged by
their atomic numbers
7. element- substance make of only one kind of atom
8. molecule- two or
more atoms bonded together
9. compound- a substance made of 2 or more different elements
10. mixture- a combination of two or more different
substances
11. chemical reaction- atoms re-arrange to form products with
different properties
12. physical property- a trait such as color, shape, hardness-
that describes a substance
13. chemical property- a trait that involves the way a substance
combines with other substances to form new substances
14. alloy- a solid solution in which metal or a nonmetal
dissolves in metal
15. acid- a chemical
compound that has a ph less than 7
16. base- a chemical
compound that has a ph more than 7
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