Name: …………………………………

Grade…………10……………………..

Subject : Chemistry

Date:……………….

Answer the following questions:

1- A positive ion forms when ___________.A. an atom loses one or more valence electronsB. an atom gains one or more valence electronsC. electrons are pulled into the nucleusD. 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 conduct an electric current when it forms an aqueous solution is a(n) _________.

A. electrolyteB. nonelectrolyteC. molecular compoundD. crystal lattice

4- In the ionic solid magnesium sulfide (MgS), there is a _________ ratio of magnesium to sulfur ions

A. one to twoB. two to two C. one to oneD. one and a half to one5- What is the ionic ratio of aluminum to oxygen in the ionic compound

aluminum oxide?A. three to oneB. one to twoC. three to twoD. 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 ?