Question

Reactivity of the elements at the extreme left of the modern periodic table , reactivity of the elements on the extreme right group $18\left(0\right)$:

• A. most , most
• B. most , least
• C. least , most
• D. least , least

Answer 1

The correct option is B most , least

Extreme left electron have $n{s}^1$ configuration, as they have incomplete octet so they are reactive metals and have tendency to loose electron.
While group 18 elements have stable octet configuration so they are least reactive.