The valence electron configuration for halogens is ns2np<span>5
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The temperature increase is from 19.5 to 100 degrees centigrade or 80.5 degrees centigrade. The calorie increase is 2.50 x 1000 x 0.238902957619 or a total of 597.25 calories. 597.25/80.5 = 7.419 calories per degree centigrade. 7.419/135 grams = 0.0549 calories/gram/degree centigrade. The conversion from kilo joules involves multiplying the calories per joule x 1000 to get the number of calories in one kilo joule and then by the 2.5.
The answer is that the pilot was tired of life and committed suicide with hundreds of passengers.
Atomic radii increase when going down a group and decreases when going towards the anion periods. So A and D.