Question

sample response: lorenzo is not correct. nonmetals increase in reactivity from left to right because nonmetals on the right have more valence electrons. they need to gain fewer electrons to have a full outer shell. however, this trend only continues until group 17, because the noble gases already have a full outer shell. therefore, their reactivity is the least of all the elements. what did you include in your response? check all that apply. ☐ nonmetals on the right need to gain fewer electrons to form an ion, so they are more reactive. ☐ the noble gases already have a full outer shell. ☐ the noble gases break the trend by being less reactive than the elements to their left.

Explanation:

1. For the first option: The sample response says nonmetals on the right have more valence electrons and need to gain fewer electrons to have a full outer shell (so more reactive), which matches this option.
2. For the second option: The sample response mentions that noble gases already have a full outer shell, so this option is included.
3. For the third option: The sample response states the trend continues until group 17 (noble gases are group 18) and their reactivity is the least, meaning they are less reactive than elements to their left (group 17), so this option is also included.

Answer:

• Nonmetals on the right need to gain fewer electrons to form an ion, so they are more reactive.
• The noble gases already have a full outer shell.
• The noble gases break the trend by being less reactive than the elements to their left.