Chemistry by dirrie
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| 🇬🇧 | 🇬🇧 |
| 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 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 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 |