The Ultimate Introverts: Elements That Refuse to Mingle

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Which word is the opposite of underestimate?
How do halogens typically react in chemical reactions?
Which word is the opposite of unsafe?
If 420 pages need to be divided equally into 5 notebooks, how many pages will each notebook contain?
Which word is similar to chassis?
What class of gases is characterized by very low reactivity and is also known as inert gases?
What do people traditionally do during the Jewish holiday of Yom Kippur?