In the gas phase, the colours of the halogens very remarkably :

Fluorine - Pale yellow
Chlorine - Pale greenish-yellow
Bromine - Deep red-brown
Iodine - Deep violet

As one moves from $F_{2}$ to $I_{2}$ , the difference between the two energy levels:

decreases and probability of transition increases

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increases and probability of transition increases

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remains unchanged and probability of transition remains unchanged

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depends on the temperature

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Solution

The correct option is A decreases and probability of transition increases
As we move down the group, repulsion decreases.Because of the difference between the two energy levels decreases and probability of transition increases and colour become more dense.

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In the gas phase, the colours of the halogens very remarkably :Fluorine - Pale yellowChlorine - Pale greenish-yellowBromine - Deep red-brownIodine - Deep violetAs one moves from F2 to I2, the difference between the two energy levels:

The correct option is A decreases and probability of transition increasesAs we move down the group, repulsion decreases.Because of the difference between the two energy levels decreases and probability of transition increases and colour become more dense.

In the gas phase, the colours of the halogens very remarkably :

Fluorine - Pale yellow
Chlorine - Pale greenish-yellow
Bromine - Deep red-brown
Iodine - Deep violet

As one moves from $F_{2}$ to $I_{2}$ , the difference between the two energy levels:

The correct option is A decreases and probability of transition increases
As we move down the group, repulsion decreases.Because of the difference between the two energy levels decreases and probability of transition increases and colour become more dense.