Size (length+width) approx.
Answer:
The metals in this group are lithium, sodium, potassium, rubidium, cesium, and francium. The gas hydrogen is also put in this group because it shares similar reactivity with the alkali metals.
I don't know if this is what you wanted or not sorry if it isn't
The question asks average kinetic energy. So it is only related with the temperature. The higher temperature is, the higher kinetic energy is. So the answer is (4).
CLOUDS would be one of the interacting parts in a weather system.
It helps our eyes to see better. For example: If you can't read a book because you see that is blurry, you might need glasses to see it much clearer