Question

Which of the following elements would you expect to be most reactive, based

on the number of valence electrons it has?

O A. Potassium (K)
OB. Titanium (Ti)
O C. Iron (Fe)
O D. Calcium (Ca)

Answer 1

A. Potassium

this is because it only has one valence electron, which can be very easily removed, hence it's reactivity.