Student A measures the volume of a box to be 254 mL. The actual volume is 250.0 mL. Student B was asked to measure out 5.00 grams of salt on a centigram balance. When the
amount was checked by the instructor, the actual mass of the salt was 4.962 g. Student C
measured the length of the boys cross country course with a measuring wheel. The
course is 5.00 km long, but the student determined that it was only 4.972 km long.
Which student has made the most accurate measurement? Hint: you can not compare
their EE values, but you may compare the PE values.

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.

the correct answer to this question is 2