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1. What is the average mass of a single atom of stronium(z=38)? Why? 2. Which of...

1. What is the average mass of a single atom of stronium(z=38)? Why?

2. Which of the following is true for numbers that come from definitions and counts? Why?

a) They are uncertain.

b) They are estimated.

c) They are exact.

d) They are less dense.

3. Which element is in group 4 period 5? Why?

4. In the compound PbCl2 what is the charge on the lead ion and why?

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