Chemistry Exam Practice Worksheet Page 3
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3
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7
8How many electrons does iodine
It’s in Group 7; Group
7
7 all have 7 electrons
have in its outer shell?
in their outer shell.
(1 mark)
Describe in detail what happens when a sodium
atom reacts with an iodine atom to produce sodium
iodide. You are allowed to draw a diagram to
support your answer. (3 marks)
The sodium atom loses 1 electron from its outer
shell and forms a 1+
ion.(1)
The iodine atom gains the 1 electron onto its
outer shell and forms a 1-
ion.(1)
The oppositely charged sodium and iodide ions
attract and form an ionic
bond.(1)
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