Question

The energy required to remove the electron from a singly ionized Helium atom is 2.2 times the energy required to remove an electron from Helium atom. The total energy required to ionize the Helium atom completely is ______. 

Options

• 20 eV

• 79 eV

• 109 eV

• 34 eV

Answer 1

The energy required to remove the electron from a singly ionized Helium atom is 2.2 times the energy required to remove an electron from Helium atom. The total energy required to ionize the Helium atom completely is 79 eV. 

Explanation:

Energy required to remove e‾ from singly ionized helium atom

= `((13.6)"Z"^2)/1^2`= 54.4 eV    (∵ Z = 2)

Energy required to remove e‾ from helium atom = x eV

According to question, 54.4 eV = 2.2x ⇒ x = 24.73 eV

Therefore, energy required to ionize helium atom

= (54.4 + 24.73) eV

= 79.12 eV