JEE MAIN - Chemistry (2019 - 12th April Evening Slot - No. 19)
Among the following, the energy of 2s orbital is lowest in :
Li
H
Na
K
Explanation
Here Z of K = 15, Na = 11, H = 1, Li = 3.
In K, because of more number of protons (high atomic number) the 2s electron experiences a higher effective nuclear charge and is closer to nucleus, thus having less energy
In K, because of more number of protons (high atomic number) the 2s electron experiences a higher effective nuclear charge and is closer to nucleus, thus having less energy
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