HAPPY Valentine's Day. Answer these questions before class on Monday, February 14th. No notes yet, so I'd like you to refer to your class notes from Wednesday, February 9th and Friday, February 11th to answer these questions.

Important do not press the enter key or the Return key while you are anwsering these questions. Your Browser will interpret either key the same as clicking the mouse on the Submit button. So BE CAREFUL!

First Name: Last Name:

Laboratory Section:

1. Given the following isotope 54Cr.

a) The number of protons? .

b) The number of electrons? .

c) The number of neutrons .

 

2. Given the following isotope 79Se-2.

a) The number of protons? .

b) The number of electrons? .

c) The number of neutrons .

 

3. What do we call the number located below the symbol of an element in the periodic table?

 

4. Given the following formula indicate whether the compound is covalent or ionic

a) AlBr3

b) Ba3As2

c) H2CO3

d) I2O4

 

5. In class we discussed how the neutral atoms liked to gain or lose electrons when combining with other elements. Indicate the number of electrons each of the following atoms are most likely to gain or lose.

a) Ca

b) P

c) Fe

d) Pb

 

6. Predict the formula of the compound formed when the following ions combine. (NOTE: It is hard to use subscripts so MgCl2 will have to be written as MgCl2 in your response.)

a) K+ and I–

b) Ba2+ and S2–

c) Mg2+ and N3–

d) Zn2+ and NO3–