9CH0 - Atomic Structure & The Periodic Table

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Last updated 2:53 PM on 9/12/26
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8 Terms

1
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Relative Atomic Mass

The weighted mean mass of all the atoms of an element compared to 1/12 the mass of a Carbon 12 atom

2
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Relative Isotopic Mass

The mass of an isotope of an element compared to 1/12 the mass of a Carbon 12 atom

3
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Relative Moleclar Mass

The weighted mean mass of the molecules compared to 1/12 the mass of a Carbon 12 atom

4
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Relative Formula Mass

The weighted mean mass of all the formula units compared to 1/12 the mass of a Carbon 12 atom

5
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Properties of Isotopes

  • They all have the same electron configuration so have identical chemical properties

  • They have different numbers of neutrons so different masses


6
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Properties of Protons

Relative Mass: 1

Relative Charge: +1

Location in Atom: Nucleus

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Properties of Neutrons

Relative Mass: 1

Relative Charge: 0

Location in Atom: Nucleus

8
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Properties of Electrons

Relative Mass: 1/1840

Relative Charge: -1

Location in Atom: Energy Levels