| A | B |
|---|
| independent variable | in a scientific investigation, the factor that is deliberately manipulated |
| dependent variable | in a scientific investigation, the factor that changes as a result of manipulation of one or more independent variables |
| model | a pattern, plan, representation, or concept |
| measurement | a quantitative description of something that includes a number and a unit , such as 42 meters: also the process of obtaining a quantitative description of something |
| SI | Le Systeme International d Unites, or the international systems of unit, which is the measurement system that is accepted worldwide |
| atom | the smallest unit of an element that maintains the properties of that element |
| proton | a subatomic particle that has a positive charge and that is located in the nucleus of an atom: the number of protons in the nucleus is in the atomic number, which determines the identity of an element |
| atomic number | the number of protons in the nucleus of an atom: the atomic number is the same for all atoms of an element |
| electron | a subatomic particle that has a negative charge |
| neutron | a subatomic particle that has no charge and that is located in the nucleus of an atom |
| mass number | the sum of the numbers of protons and neutrons in the nucleus of an atom |
| nucleus | in physical science, an atoms central region, which is made up of protons and neutrons |
| mass number | the sum of the numbers of protons and neutrons in the nucleus of an atom |
| nucleus | in physical science, an atoms central region, which is made up of protons and neutrons |
| electron cloud | a region around the nucleus of an atom where electrons are likely to be found |
