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IonsIB MYP Chemistry: Flashcards

What these 14 flashcards ask

  • What is an ion?
  • What type of ion forms when an atom loses electrons?
  • What type of ion forms when an atom gains electrons?
  • Do atoms form ions by gaining or losing protons?
  • What ion does a Group 1 metal form?
  • What ion does a Group 2 metal form?
  • What ion does a Group 6 non-metal form?
  • What ion does a Group 7 non-metal form?
  • How many electrons does a sodium ion, Na⁺, have?
  • How many electrons does an oxide ion, O²⁻, have?
  • What is the electron arrangement of Na⁺?
  • What is the electron arrangement of Cl⁻?
  • Why do atoms form ions?
  • What does the name of a simple negative ion end in?

Exam questions on Ions

  1. A sodium atom, with electron arrangement 2,8,1, reacts with a chlorine atom, with electron arrangement 2,8,7, to make sodium chloride. Sodium chloride is an ionic compound made of sodium ions and chloride ions. Chlorine has atomic number 17.
    Explain why a chloride ion has a charge of 1-.2 marks
  2. Magnesium oxide is used to line furnaces because it can withstand very high temperatures. It is an ionic compound made of magnesium ions, Mg²⁺, and oxide ions, O²⁻. Magnesium has atomic number 12 and is in Group 2. Oxygen has atomic number 8 and is in Group 6.
    Explain, using its group number, why magnesium forms an ion with a charge of 2+.2 marks
  3. Aluminium fluoride is an ionic compound made of aluminium ions, Al³⁺, and fluoride ions, F⁻. Aluminium has atomic number 13 and is in Group 3. Fluorine has atomic number 9, with the electron arrangement 2,7, and is in Group 7.
    Describe how an aluminium atom forms an Al³⁺ ion, and state the number of protons and electrons in the ion.3 marks
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Written by the Exaim team, led by Shaun Daswani (Head of Upper Secondary, Improve ME Institute; MSc Financial Mathematics, Imperial College London; BSc, UCL) and Jason Daswani (operational lead, Improve ME Institute; LSE).