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Atomic structure

This is a set of key words from chapter 29 and 30

TermDefinition
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
Created by: Aoife2k13
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