Question

ionization energy

1. choose the atom from each of the following pairs with the greater ionization energy:

a. be and ba
b. al and ar
c. ca and cl

Explanation:

• a. Be and Ba: Ionization energy decreases down a group. Beryllium (Be) is above Barium (Ba) in Group 2. So, Be has a greater ionization energy.
• b. Al and Ar: Ionization energy generally increases across a period. Aluminum (Al) is a metal and Argon (Ar) is a noble gas. Noble gases have very stable electron configurations. So, Ar has a greater ionization energy.
• c. Ca and Cl: Ionization energy generally increases across a period. Calcium (Ca) is a metal and Chlorine (Cl) is a non - metal. So, Cl has a greater ionization energy.

Answer:

a. Be
b. Ar
c. Cl