Those elements impart colour to the flame on heating \( \mathrm{p} ...

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Those elements impart colour to the flame on heating
\( \mathrm{p} \) in it, the atoms of which require low energy for the

W. ionisation (i.e. absorb energy in the visible region of spectrum). The elements of which of the following groups in Modern periodic table will impart colour to the flame?
(A) 2
(B) 13
(C) 1
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