Question 9 of 10 A team of engineers has decided to design a new shoe for people suffering
from a painful foot condition. What should the engineers do during the
planning stage of their project?
A. Look at the trial's results to see how the design can be improved.
O B. Estimate how much potential consumers would be willing to pay
for this new shoe.
C. Have patients wear the new shoe in an experimental trial to see if
symptoms improve.
D. Build a variety of shoe models.

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.