(40) GCSE Chemistry Revision "Relative Atomic Mass"

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9 Terms

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Relative Atomic Mass

A weighted average of the mass numbers of an element's isotopes based on their abundance.

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Isotopes

Atoms of the same element with different numbers of neutrons.

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Abundance

How common each isotope is in a sample.

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Chlorine Isotopes

Chlorine has isotopes with mass numbers of 35 and 37, with 35 being more abundant.

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Calculation of Relative Atomic Mass

(mass number of isotope one x percent abundance of isotope one + mass number of isotope two x percent abundance of isotope two) / 100.

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Example of Boron's Isotopes

Boron has two isotopes: mass number 10 with 20% abundance, and mass number 11 with 80% abundance.

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Relative Atomic Mass of Boron

Calculated to be 10.8, rounded to 11 in the periodic table.

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Magnesium Isotopes

Magnesium has three isotopes: mass number 24 (79% abundance), 25 (10% abundance), and 26 (11% abundance).

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Relative Atomic Mass of Magnesium

Calculated to be 24.3, rounded to 24 in the periodic table.