Chemistry Chemical Bonding MDCAT 2010
PMDC Verified Question 102 of 102
The ionization energy of hydrogen atom is:
A
Zero
B
131.3 kJ/mole
C
13.13 kJ/mole
D
1313.31 kJ/mole
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: 1313.31 kJ/mole
Concept:

Ionization energy (IE) is the exact amount of energy required to remove an electron from a gaseous atom in its ground state.

Formula:

$$ \text{IE of Hydrogen} = 1312.36 \text{ kJ/mol} \approx 1313 \text{ kJ/mol} $$

Solution:

  • The single electron in a Hydrogen atom is tightly held in the 1s orbital close to the nucleus.


  • Experimental data establishes the required energy to overcome this electrostatic attraction is roughly 1313 kJ per mole of Hydrogen atoms.


Why other options are incorrect:

  • Option A, Option B, Option C: These values are orders of magnitude too low to ionize an atom.

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