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Unformatted text preview: Name: .. Pilot Exam Nr 2 Chapters 3 and 4 1. Atom of which of the following elements needs to lose two valence electrons to achieve the noble gas configuration? a) Na b) Si c) Ba d) S  2. Atom of which of the following elements needs to gain one valence electron to achieve the noble gas configuration? .....  a) Ca b) Al c) S d) Br 3. To gain a noble gas configuration an atom of aluminum must  a) lose one electron b) lose three electrons c) gain one electron d) gain three electrons 4. At each of the following elements write its most stable ion Ca . Na ............. S ..... F  5. Which ion should be the most stable a) Cl 2- b) Na 2+ c) Ba 2+ d) Al 2+ ..  6. Sodium chloride consists of a) molecules of NaCl b) atoms of Na and Cl c) Na + and Cl- ions  7. Write the formula of the ionic compound formed from a) Aluminum and Oxygen...
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