Question

The emission as well as absorption spectrum is not shown by:

• A. ${He}^{+}$
• B. ${He}^{-}$
• C. $H^{+}$
• D. $He$

Answer 1

Answer: (C)

$H^{+}$

There are no electrons in $H^{+}$ ion, so it neither gives emission spectrum nor absorption spectrum.