Which is the most reasonable explanation for a drop of temperature for gas

This element exists in adundance in the sun. explain how you would go about capturing sunlight. would this captured sunlight contain any of the element?

The alkali metals (group 1) consist of lithium (3), sodium (11), potassium (19), rubidium (37), cesium (55), and francium (87). they are soft, metallic solids with low densities and low melting points. based on the data shown in figure 1, how many valence electrons do alkali metals share?

The grooves or folds of the brain are called