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Combined Science: Chemistry

GCSE · Edexcel · higher

QuestionsFlashcards

Group 1
- Group 1 (Alkali Metals)
  5
- Group 1: Reactivity & Electronic Configurations
  3
Group 7
Group 0

Calculating Relative Atomic Mass Flashcards

All 4 cards in this deck

What is the equation for the relative atomic mass of an element from the masses and percentage abundances of its isotopes?: relative atomic mass = sum of (isotope mass × percentage abundance) ÷ 100
What is the relative atomic mass of an element?: The mean mass of its atoms, taking into account the mass and percentage abundance of each of its isotopes.
Why are the relative atomic masses of some elements not whole numbers?: Because the element exists as a mixture of isotopes of different masses, and the relative atomic mass is the weighted average of them.
True or false? Because chlorine has a relative atomic mass of 35.5, a chlorine atom can have a mass number of 35.5.: False. Mass numbers are always whole numbers; 35.5 is the average over the isotopes present.