Which of the following best describes the noble gases?

a. have a full outer electron shell

b. have an outer electron shell but only needs one electron

c. are highly reactive

d. combine easily with other elements

Answer;

A. have a full outer electron shell

Explanation;Noble gases are elements that are found in Group 18 of the periodic table. They include, Neon, Argon, Krypton, Xenon, etc.The outer shell of valence electrons is considered to be “full” in noble gases, giving them little tendency to participate in chemical reactions. This means they have an octet configuration.They are all monatomic gases under standard conditions, including those with larger atomic masses than many other elements that are solids under standard conditions.