A) Oxygen
B) Nitrogen
C) Fluorine
D) Sulphur
Correct Answer: D
Solution :
The amount of energy needed to take out most loosely bound electron from a neutral isolated gaseous atom is called ionization energy. In a group from top to bottom, ionization potential decreases because number of shells increase. In a period of from left to right ionization potential generally increases because effective nuclear charge increases. The first ionization potential of nitrogen is greater than oxygen due to extra stability of half-filled 2p subshell. The order of ionization potential is as| Element | S | < | O | < | N | < | F |
| IP (kJ/mol) | 999.4 | 1313.7 | 1402.1 | 1680.8 |
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