| A | B |
|---|
| alpha particle | positively charged particle that can pass through thin sheets of matter |
| atom | smallest particle of an element, the building block of matter |
| atomic nucleus | the central portion of the atom containing protons and neutrons |
| bias | individual opinion on issues or that may affect how we see data |
| electron | negatively charged particle outside of an atom's nucleus |
| element | a substance that cannot be broken down further |
| hypothesis | an educated guess that is tested with the scientific method |
| plum-pudding model | model where atom has electrons surrounded by positive charge |
| theory | well supported, dominant explanation that accounts for scientific laws |
| flask | measuring glass with flat bottom and curved, bottle-like top |
