| Gold Foil Experiment | | horizontal rows are called |
| heterogeneous | | ___________properties can be observed without destroying a substance. |
| solution | | alpha particles are |
| chemical properties | | Proposed the first scientific model of the atom. |
| electron | | two or more substances physically blended |
| chemical | | Rutherford's famous experiment |
| protons electrons | | Observing a ____________________property always changes a substance into a new substance. |
| physical | | these have about the same mass |
| element | | not uniform throughout |
| mixture | | same element with different numbers of neutrons |
| chemical change | | the three subatomic particles. |
| isotopes | | vertical columns are called |
| properties | | protons plus neutrons |
| Plum pudding model | | arranges elements in order of increasing atomic number |
| extensive | | the smallest part of an element that retains its identity |
| empty space | | says that in any chemical reaction the mass of the reactants and products must be the same |
| Democritus | | Rutherford discovered that atoms have a ___________ |
| atomic number | | a difference in _____________is used to separate a mixture. |
| JJ thomson | | Rutherford's nuclear model did not account for this |
| Robert Millikan | | producing a gas, color change, emitting heat or light, |
| physical properties | | made of two or more elements |
| periodic table | | The number of protons in the nucleus of an atom is called the |
| proton neutron electron | | __________________discovered the electron. |
| John Dalton | | Dalton viewed atoms as ______________ |
| compound | | contains only one type of atoms |
| atom | | a ____________can be separated chemically into its elements. |
| periods | | all elements in a vertical column have similar |
| compound | | Dalton said atoms of different atoms combine in ___________________ratios to form compounds. |
| Law of Conservation of Mass | | determined the mass of the electron |
| hard spheres | | In a neutral atom the number of _________________equals the number of ____________________. |
| atomic mass | | first suggested that atoms exist |
| intensive | | 1/1800 the mass of a proton |
| helium nuclei | | Thomson's model of the atom |
| nucleus | | a homogenous mixture is also know as a _______. |
| small whole number | | Atoms are mostly ________________ |
| proton neutron | | _____________________physical properties depend only on the type of matter. |
| groups | | ________________physical properties depend only on the amount of matter. |
