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ATOMIC STRUCTURE (Subatomic Particles (Proton (mass: 1, charge: +1,…
ATOMIC STRUCTURE
Atom
is the smallest indivisible particle of an element that retains all properties of the element.
made up of subatomic particles ( proton, neutron & electrons )
Subatomic Particles
Proton
mass: 1
charge: +1
nucleus
Neutron
mass: 1
nucleus
charge: 0
Electron
mass: 1/1840
charge: -1
electron
Nucleon
Number
=
mass
number
total number of protons & neutrons
Proton
Number
=
atomic
number
total number of protons
Electron Shell
first shell max 2 electrons
second & third shell max 8
use the proton number to find electronic configuration
Valence Electron
electrons in the furthest away shell
chemical properties of an element depend on number of valence electrons
Isotopes
atoms of the same element with
same no of protons
but different no of neutrons
Properties
have similar chemical properties
have different masses therefore different physical properties