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Atomic Structure
This is a set of keywords from Chapter 29 & 30
| Term | Definition |
|---|---|
| Atom | Smallest particle of an element |
| Proton | A particle inside the nucleus that is a positive charge |
| Electron | A particle in the outer shell of a nucleus that is a negative charge |
| Neutron | A particle found inside the nucleus that has no charge so it is neutral |
| Atomic Mass Unit | The mass of a sub-atomic particle. In short, a.m.u |
| Sub-atomic particles | Particles that are inside an atom. |
| Planetary model | Niels Bohr proposed that the electroms move around the nucleus in fixed paths called orbits |
| Atomic number | The number of protons and electrons in the nucleus of that atom. Also, its the position of an element in a periodic table |
| Atomic mass | The sum of the number of protons and neutrons |
| N=number | |
| Group | Vertical columns in the periodic table |
| Period | Horizontal columns in the periodic table |
| Alkali metal | First group of the periodic table |
| Alkaline Earth Metal | Second group of the periodic table |
| Halogens | Seventh group of the periodic table .non metallic elements |
| Nobel gases | Inert gases. Unreactive gases |
| Periodic table | A list of all elements i order of increasing atomic number |
| Isotopes | Atoms of the same element which have different numbers of neutrons in the nucleus |
| Mendelev | Arranged the periodic tAble |
| Dalton | Put forward a theory about atoms |
| Niels Bohr | Proposed that electrons orbit the nucleus |
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TriciaMondala