The Sun releases a lot of energy in many different forms. The Earth receives a small portion of this energy but it is enough to help keep the atmospheric temperature from changing too much. Which of the following allows the Sun’s energy to reach the Earth? (SC.7.P.10.1)A. conduction B. convection C. radiation. D. reflection

C would be my best guess because of ultraviolet radiation

Hope this helps! Good luck :)

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.