Unit Test: Astronomy Mid-Unit Test - Part 1

When is it summer in the Northern Hemisphere?

when the Northern Hemisphere is closest to the sun
when neither pole is receiving the most direct sunlight
during an equinox
when the Northern Hemisphere is tilted toward the sun

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?

Why does the sun appear to be the brightest star in the sky? a- its apparent brightness is much greater than other stars. b- it burns more gas, making it brighter than any other star. c- it is the largest star in the galaxy, so it is the brightest star. d- its relative distance to earth is closer than the other stars.

Draw two cyclic constitutional isomers of cis-1