Which statements about hydrogen are true?
I. H has a lower ionization energy than He.
II. H^- is smaller than H.
III. H has a higher effective nuclear charge than He.
IV. H is always a metal.V. H does not have a second ionization energy.

Question

Quizplus · Accepted Answer

I: This statement is false as He has a lower ionization energy than H. II: This statement is true as H^- is a sulfur ion and has more electrons than hydrogen. III: This statement is true as the effective nuclear charge increases with atomic number, and H has a higher atomic number than He. IV: This statement is false as H can be either a metal or a nonmetal depending on the context. V: This statement is true as H only has one electron and therefore cannot have a second ionization energy.

Which Statements About Hydrogen Are True