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Assertion: Hydrogen's 2s orbital has more energy than lithium's 2s orbitalReason: For same orbital, as atomic number increases energy decreases(a) Both assertion and reason are true, reason is correct explanation of assertion(b) Both assertion and reason are true, but reason is not a correct explanation of the assertion.(c) Assertion is true, but reason is false(d) Assertion is false, but reason is true

Answer»

(a) Both assertion and reason are true, reason is correct explanation of assertion

An increase of atomic number is in the order, H < Li

Energies of the orbitals in the same subshell decrease with an increase in the atomic number. 

Hence, 2s orbital (energy level) of Li will be less than H



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