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Questions 3.8b

  1. An atom X has 8 protons and 10 neutrons. What is its mass number?
  2. Element Y has 4 neutrons and a mass number of 7. Find its atomic number.


Answers to Questions 3.8b

  1. Structures of magnesium and aluminium metals
  2. A nucleus is the combination of all protons and electrons at the centre of an atom or ion. An ion is a charged particle formed when an atom gains or loses outer electrons