Question

In what respect electronic configuration of hydrogen and halogens are similar?

• A. Hydrogen and halogens have one electron in their outermost shell
• B. Hydrogen and halogens have one electron less than the noble gas configuration
• C. Hydrogen and halogens can lose one electron to form positive ions
• D. Hydrogen and halogens show noble gas configuration

Answer 1

Answer: (B)

$H - 1s^1$ ; $He - 1s^2$
Halogen, $X - ns^2\,np^5$ ; Inert gas $- ns^2np^6$
Both have one electron less than the nearest noble gas configuration.