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

Answers (1)

The answer is the option (i) and (iii)

Explanation: Group I that is the alkali metals group and Group II elements are the alkaline earth metals, they are reactive metals with low ionisation enthalpies.

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