Which element will most easily lose an electron? a. calcium (ca) b. potassium (k) c. boron (b) d. krypton (kr)

Option B. Potassium(K).

Explanation:

Electronic configuration of the given elements are:

Ca - [Ar] 4s² K - [Ar] 4s¹B - [He] 2s2 2p1Kr -  [Ar] 3d¹⁰4s²4p⁶Krypton(K) have 36 electrons and it is a noble gas and hence all of its shells are completely filled with electrons and hence it will never loose electrons in normal conditions.Boron(B) have 5 electrons and 3 electrons in its outer shell. In order to attain a stable configuration it will loose 3 electrons and it is difficult to loose 3 electrons at a time for an atom.Calcium(Ca) have 20 electrons and 2 electrons in its outermost shell, in order to attain a stable configuration it will loose 2 electrons. it is quite difficult but easier than Boron.Potassium(K) have 21 electrons and 1 electron in its outermost orbit and in order to attain a stable configuration it will loose 1 electron. It is much easier to donate 1 electron than 2 or 3 electrons.

Result: Potassium will loose an electron most easily from the given elements.