Question

To remove a single electron from its outer most shell, which of the following will require a shortest wave length photon?

• A. $Mg$
• B. $Si$
• C. $P$
• D. $S$
• E. $Cl$

Answer 1

The correct option is E $Cl$

As we know that shortest wavelength means high energy required to remove an electron from the outer shell of an atom.

In all given atoms only Cl has the highest electronegativity means high electron attracting power, therefore, required high energy to remove an electron from its outer shell.

Therefore, option E is the correct answer.