Chemistry- Atomic Structure

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Definitions

Atomic number: number of protons in the nucleus

Mass number: number of protons + neutrons in the nucleus

Mass of neutrons: mass number + atomic number

Isotopes: atoms of the same element with a different number of neutrons

Allotropes: different phisical forms of an element (eg: oxygen, ozone)

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Particles

Protons

  • relative mass= 1
  • charge= positive 1
  • position: nucleus

Neutrons

  • relative mass= 1
  • charge= 0
  • position: nuleus

Electrons

  • relative mass= 1/1836
  • charge= negative 1
  • position: outside the nucleus
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