| What were John Daltons ideas about atoms? | all matter are made of tiny particles called atoms, which are tiny spheres that can't be divided. |
| Who created the Plum Pudding Model? | JJ Thompson |
| How does the Plum pudding model look like? | A ball of positive charge with negative electrons embedded in it. |
| Who created the nuclear model | Ernest Rutherford |
| What was included in the nuclear model? | the mass of the atom is concentrated at its nucleus and the nucleus is positively charged. |
| What adaptations were made to the nuclear model and who adapted them? | the nucleus contained small particles called protons and each proton has a small amount of positive charge. Niels Bohr. |
| How did Rutherford test for the nuclear model? | Positively charged alpha particles were fired at thin gold foil. Most alpha particles went straight through the foil. But a few were scattered in different directions. |
| What other adaptations were made to Bohr's discoveries and who discovered them? | Neutrons were found by James Chadwick |
| What is the radius of an atom | 1 nm |
| What is the radius of the atoms nucleus? | 1 x 10^-14 |
| What does the nuclei of all atoms contain? | They all contain subatomic particles called protons and neutrons. |
| What is the relative mass and relative charge of a proton? | 1 and +1 |
| What is the relative mass and relative charge of a neutron? | 1 and 0 |
| What is the relative mass and relative charge of an electron? | Very small and -1 |
| What is the atomic number? | The number of protons in an atom of an element |
| What is the mass number? | total number of protons and neutrons. |
| How do you calculate the number of protons in an atom | mass number - atomic number |
| What do Isotopes contain? | the same atomic number but different mass numbers |
| what is relative atomic mass? | the average mass of atoms of an element relative to the mass of an atom of carbon 12. |
| How to calculate relative atomic mass? | total mass of atoms/ total number of atoms |
