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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

The Nucleus Flashcards

All 4 cards in this deck

How does the size of the nucleus compare with the size of the whole atom?: The nucleus is very small compared with the overall size of the atom.
Where is most of the mass of an atom found?: Concentrated in the nucleus (the protons and neutrons).
What is meant by the mass number of an atom?: The total number of protons and neutrons in its nucleus.
e.g. an atom with 17 protons and 18 neutrons has mass number 35.
What is meant by the atomic number of an atom?: The number of protons in its nucleus — this number is the same for all atoms of an element and is unique to that element.