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Atomic structure
This is a set of key words from chapter 29 and 30
| Term | Definition |
|---|---|
| Atom | Is the smallest part of an element which still retains the properties of that element |
| Proton | A particle with a positive charge, 1 amu and its found in the nucleus |
| Electron | A particle with a negative charge 1/1840 amu and its found in the outer shell |
| Neutron | A particle with neutral charge 1 amu and its found in the nucleus |
| Atomic mass unit | (Amu) what mass is measured in because it weighs so little |
| Sub-atomic particles | Tiny particles inside an atom |
| Planetary model | The theory that electrons move around the nucleus in fixed paths called orbits |
| Atomic number | Shows the position on the periodic table and number of electrons and protons |
| Atomic mass | Number of protons + number of neutrons |
| Group | The line of elements going down on the periodic table |
| Period | The line of elements going across on the periodic table |
| Alkali metals | Group one on the periodic table |
| N = numbers | ** the position of an element on the periodic table *** |
| Alkaline earth metal | Group two on the periodic table |
| Halogens | Group seven on the periodic table |
| Nobel gases | Group eight on the periodic table |
| Periodic table | Is an arrangement of elements in order of increasing atomic number |
| Isotopes | Atoms of the same element that have different numbers of neutrons in their nucleus |
| Mendeleev | Arranged all the elements on the periodic table |
| Dalton | Put foreword a theory of atoms |
| Neils bohr | Proposed that electrons orbit the nucleus |
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