Question

list the following elements in increasing first ionization energy. barium calcium chlorine phosphorus zinc zn<ba<ca<cl<p p<cl<zn<ba<ca ba<ca<zn<p<cl cl<p<zn<ca<ba

Explanation:

Step1: Recall ionization - energy trends

First - ionization energy generally increases across a period and decreases down a group in the periodic table.

Step2: Locate the elements in the periodic table

Barium (Ba) is in Group 2, Period 6; Calcium (Ca) is in Group 2, Period 4; Chlorine (Cl) is in Group 17, Period 3; Phosphorus (P) is in Group 15, Period 3; Zinc (Zn) is in Group 12, Period 4.

Step3: Compare based on trends

Since Ba and Ca are in Group 2 and Ba is below Ca, Ba has a lower first - ionization energy than Ca. Among P, Cl, and Zn in Period 3 and 4, P and Cl are non - metals and Zn is a metal. Non - metals have higher ionization energies than metals in the same period. Also, Cl is to the right of P in Period 3, so Cl has a higher ionization energy than P. And Zn is a metal in Period 4, so its ionization energy is lower than that of non - metals in Period 3.

Answer:

Ba<Ca<Zn<P<Cl