2. How would a small change in the Sun's radiation affect our
ecosystems?

The carcinogen (U.V.) helps to stabilize the formation of clouds and maintain life in ecosystem.

If drastic changes were made to the radiation of sun, it will lead to ecological imbalance such as changes in O3 layer, etc and surely, the last day (D-day, what we majorly call) will come!

where is the following

explanation:

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.