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Atomic Structure

This is a set of keywords from Chapter 29 & 30

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
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
Created by: TriciaMondala