Use the periodic table from the lesson to answer the following question.

f has valence electrons.
a. 2
b. 7
c. 9
d. 19

Select the correct text in the passage. which sentences describe examples of sustainable living? i live in an old apartment building downtown, but my company is based in an office park on the outskirts of the city. i drive an old car that needs to be replaced. i plan to buy a hybrid for better gas mileage, but for now i am able to carpool with a couple of friends from work. the drive to the office park is about 45 minutes each way, but we do get to work in a modern building. the architects just received a leed certification for the design.

How are isotopes of the same chemical element alike? how are they different?

What is the mass of 0.46 mol of mgcl2