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Electron gain enthalpy
JEE Main level
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Difficulty 2 of 3
pt142
Which of the following elements have a positive first electron gain enthalpy?
A
Cl
B
Ne
C
Mg
D
S
Answer: B, C
Ne has a complete octet (value about +116) and Mg has a filled
3
s
2
subshell (about +
39
kJ
mo
l
−
1
). Chlorine (-349) and sulfur (-200) release energy.
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