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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 |