List the elements Cs,Ca,Ne,Na,Ar in order of decreasing first ionization energy.
A)Ar Ca Cs Na Ne
B)Ne Ar Ca Na Cs
C)Ne Ar Na Cs Ca
D)Ne Na Cs Ca Ar

Question

List the elements Cs,Ca,Ne,Na,Ar in order of decreasing first ionization energy.
A)Ar > Ca > Cs > Na > Ne
B)Ne > Ar > Ca > Na > Cs
C)Ne > Ar > Na > Cs > Ca
D)Ne > Na > Cs > Ca > Ar

Quizplus · Accepted Answer

First ionization energy generally increases across a period (from left to right) and decreases down a group (from top to bottom) in the periodic table. Neon (Ne) and argon (Ar) are noble gases with the highest ionization energies in their respective periods due to their full electron shells, making them very stable. Among the given elements, neon has the highest first ionization energy, followed by argon. Among the metals (Ca, Na, Cs), cesium (Cs) has the lowest first ionization energy because it is the largest atom with the most loosely held outer electron, followed by sodium (Na), and then calcium (Ca) has a higher first ionization energy than Na and Cs but lower than the noble gases.

List the Elements Cs,Ca,Ne,Na,Ar in Order of Decreasing First Ionization