How could each of the following atoms react to achieve a noble-gas configuration? a. iodine, b. strontium, c. nitrogen, d. krypton.

Why do noble gases not take part in a chemical reaction?

Write the formula for each compound: a. phosphorus pentabromide, b. diphosphorus trioxide, c. arsenic tribromide, d. carbon tetrachloride.

The magnetic properties of an element depend on the number of unpaired electrons it has. Explain why iron, Fe, is highly magnetic but neon, Ne, is not.

Why are technetium, promethium, and neptunium considered natural elements even though they are not found on Earth?

Write a paragraph describing in your own words how synthetic elements are created. Discuss what modification has to be made to the equipment in order to synthesize superheavy elements.

Which of the following pairs of elements are most likely to form an ionic bond? F. Br and Ca, G. Br and N, H. Ca and Mg, I. Ca and Fe.

The ionic substance strontium oxide, SrO, forms from the reaction of strontium metal with molecular oxygen. The arrangement of the ions in solid SrO is analogous to that in solid NaCl: Write a balanced equation for the formation of SrO(s) from its elements.

Lindy is making a wooden picture frame. She cuts the top and bottom pieces at a 45$\degree$ angle. If the corners are right angles, explain how Lindy knows that each pair of opposite sides is parallel.

If the synchrotron had not been developed, how would the periodic table look?

Let x be a random variable representing the amount of sleep each adult in New York City got last night. Consider a sampling distribution of sample means $\bar{x}$. What value will the standard deviation $\sigma_{\bar{x}}$ of the sampling distribution approach?

The student government claims that 85% of all students favor an increase in student fees to buy indoor potted plants for the classrooms. A random sample of 12 students produced 2 in favor of the project. What is the probability that 2 or fewer in the sample will favor the project, assumping that the student government is correct? Do the data support the student government claim, or does it seem that the percentage favoring the increase in fees is less than 85%?

In what ways were the lives of a noblewoman and a peasant woman the same? different?

Flexibility is the range of motion around

a. specific bones.

b. a joint or series of joints.

c. the tendons.

d. the muscles.