3. A student performed the following reaction in the lab:
2Mg + O2 → 2MgO
She isolated 25.8g of MgO. She also knew how to calculated the expected or the theoretical yield based on the amount of her starting materials (She was of course one of Dr. W’s prize students). She calculated the theoretical yield to be 28.9g.
What was the % yield for this experiment?

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.