Question

	1st Ionization Energy (eV)	2nd Ionization Energy (eV)
U	5.6	5.6
V	1.7	2.9
X	1.1	13.6
Y	12.4	2.8
Z	2.9	1.7

From the information given in the above table find the group IA metal?

• A. U
• B. V
• C. X
• D. Y
• E. Z

Answer 1

Answer: (C)

X

For group $IA$ metals one electron is present in their valence shell as they are alkali metals so they require minimum first ionization energy to lose the electron and attain stable gas configuration 2, 8 while the second ionization energy will be extremely high to remove the electron from the stable configuration of 2, 8. So the element X with small 1.1eV first ionization energy and very high second ionization energy 13.6eV is group IA element.