What are the elements in the rightmost columns of the Periodic Table, as we face the Table?

Answer 1

#"The halogens and the Noble Gases..........."#, i.e. #"Group 17 and Group 16."#

Because astatine is so rare, its chemistry would be limited. The noble gases all have a complete valence shell and are gases under normal conditions. The halogens, fluorine, chlorine, bromine, and iodine, are all non-metals.

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Answer 2

Xavier Avery

As we look at the Periodic Table, the elements in the rightmost column that fall under the category of Noble Gases are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.