| 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 |
Biology Lab Midterm
