Karla is training for a marathon she can run 2 miles and 16 minutes if she runs at that pace the whole race how long will it take her to run the entire marathon

We know that a marathon is 26.2 miles, so we can set up a proportion to solve for the time it would take her to run the entire marathon:

Then solve for x by cross multiplying:

So now we know it will take Karla 209.6 minutes to run the entire marathon, or, in hours, 3.49 hours.

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.