Grade 9 Science Chemistry Exam Review 2014 | Page 16
48. ANS:
The 2+ represents the loss of two electrons that occurred to make the atom stable (having
a full outer valence shell).
49. ANS:
50. ANS:
Elements are individual atoms (or atoms of the same type), whereas compounds are
groups of different atoms joined together.
PROBLEM
51. ANS:
16 | P a g e
Grade 9 Science Chemistry Exam Review 2014 | Page 15
Grade 9 Science Chemistry Exam Review 2014 | Page 17
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