use the periodic table to select the element that best fits each of the following descriptions. noble gas…
use the periodic table to select the element that best fits each of the following descriptions. noble gas: oxygen chlorine krypton complete a group 5a element: actinium arsenic rhenium done
Answer
Explanation:
Step1: Recall noble - gas definition
Noble gases are in group 18 of the periodic table.
Step2: Identify noble - gas among options
Oxygen is in group 16, chlorine is in group 17, krypton is in group 18. So krypton is a noble gas.
Step3: Recall group 5A elements
Group 5A elements have 5 valence electrons. Actinium is in the actinide series, arsenic is in group 5A, rhenium is in group 7B. So arsenic is a group 5A element.
Answer:
Noble gas: krypton A group 5A element: arsenic