Other examples of ionic bonding
2 marks · NormalState the type of ion formed by barium (Ba) and how it achieves a noble gas electron configuration.
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Barium forms a 2+ ion (Ba2+) by losing 2 electrons to achieve the electron configuration of xenon.
Also accept: It forms Ba2+ by losing two electrons to have the same configuration as xenon.
Common mistakes: Gaining electrons instead of losing; Incorrect charge
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Marking points
B1 · 1 mark · States Ba2+ ion or 2+ charge
B2 · 1 mark · Mentions loss of 2 electrons and achieves noble gas configuration as xenon/Xe
Worked solution
Barium (Ba) is in Group 2, so it loses two electrons to form a 2+ ion (Ba2+). This gives it the same electron configuration as xenon.