1. Name: …………………………………
Grade…………10……………………..
Subject : Chemistry
Date:……………….
Answer the following questions:
1- A positive ion forms when ___________.
A. an atom loses one or more valence electrons
B. an atom gains one or more valence electrons
C. electrons are pulled into the nucleus
D. electrons are pushed out of the nucleus
2- Explain why the zinc 2+ ion has some stability
A. The zinc ion has achieved a noble gas configuration.
B. The zinc ion has full s, p, and d sublevels to form a pseudo-noble gas
configuration.
C. The zinc ion is a transition metal.
D. The zinc ion has bonded with two free electrons.
3- An ionic compound that will conductan electric current when it forms an
aqueous solution is a(n) _________.
A. electrolyte
B. nonelectrolyte
C. molecular compound
D. crystal lattice
2. 4- In the ionic solid magnesium sulfide (MgS), there is a _________ratio of
magnesium to sulfur ions
A. one to two
B. two to two
C. one to one
D. one and a half to one
5- What is the ionic ratio of aluminum to oxygen in the ionic compound
aluminum oxide?
A. three to one
B. one to two
C. three to two
D. one to three
6- Why is the magnesium ion (Mg2+) more stable than the magnesium atom
(Mg)?
A. Twenty electrons are more stable than eighteen electrons.
B. Eighteen electrons are less stable than twenty electrons.
C. The two electrons more than the noble gas configuration is more stable.
D. The noble gas configuration is more stable.
7- Explain :
The lattice energy of SrC l 2 is between the lattice energies of MgO and NaF ?
