Question:
Those elements impart colour to the flame on heating in it, the atoms of which
require low energy for the ionisation (i.e., absorb energy in the visible region
of the spectrum). The elements of which of the following groups will impart colour
to the flame?
(i) 2
(ii) 13
(iii) 1
(iv) 17
Solution:
Option (i) and (iii) are the answers.