Question

The minimum energy required to remove an electron from the ground state to outside the atom is called _________.
1. Kinetic energy of electron
2. Emission energy
3. ionization energy
4. work function

Answer 1

Correct Answer - Option 3 : ionization energy

CONCEPT:

• The minimum energy required to remove an electron from the ground state to outside the atom is called ionization energy.

The energy of electrons in any orbit is given by:

\({\bf{Energy}}\;{\bf{in}}\;{\bf{nth}}\;{\bf{orbit}}{\rm{\;}}\left( {{E_{n\;}}} \right) = \; - 13.6\;\frac{{{Z^2}}}{{{n^2}}}\;eV\)

Where n = principal quantum number and Z = the atomic number

• This is the energy that is required to remove an electron from its orbit.

CALCULATION:

• The minimum energy that is given to the electron and leaves the atom, this energy is known as the ionization energy.
• So the correct answer is option 3.