Spec 1CH0
Revise Edexcel GCSE Chemistry 2.1.3 Mass number, isotopes and relative atomic mass with the question bank, lessons, revision guides, and flashcards.
1.7 Explain the meaning of the term mass number of an atom. 1.8 Recall that atoms of a given element have the same number of protons in the nucleus and that this number is unique to that element. 1.9 Describe isotopes as different atoms of the same element containing the same number of protons but different numbers of neutrons in their nuclei. 1.10 Calculate the numbers of protons, neutrons and electrons in atoms given the atomic number and mass number. 1.11 Explain why the existence of isotopes results in relative atomic masses of some elements not being whole numbers.
