Match the elements given in Column-$I$ with the colour they impart to the flame given in Column-$II$.

Column-$I$	Column-$II$
$A$. $Cs$	$1$. Apple green
$B$. $Na$	$2$. Violet
$C$. $K$	$3$. Brick red
$D$. $Ca$	$4$. Yellow
$E$. $Sr$	$5$. Crimson red
$F$. $Ba$	$6$. Blue

(A-6, B-4, C-2, D-3, E-5, F-1) The correct matches are: $A-6, B-4, C-2, D-3, E-5, F-1$.
This occurs because the heat from the flame excites the outermost orbital electron to a higher energy level.
When the excited electron returns to the ground state,it emits radiation in the visible region,imparting a characteristic colour to the Bunsen flame.