Please help me
which of the following elements is more reactive
A)Calcium
B)Magnesium
C)potassium
D)Sodium

Option C) potassium

Explanation:

According to the reactivity series of metals, potassium K is the most reactive and electropositive metal. it is followed by sodium Na, Magnesium Mg, and Calcium Ca.

Thus, the descending order of reactivity is as follows: K > Na > Mg > Ca which makes potassium displaces the less reactive elements from their respective solutions during chemical reactions.

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

the answer for sodium is 0.186

the answer for rubidium is 0.251