Question

Q. Among the following energy of 2s is lowest in:
1)K
2)H
3)Li
4)Na

Answer 1

Answer:

K( Potassium)

Increase of attraction decreases the energy of the orbital and the electron present in it. Energies of the orbitals in the same subshell decrease with increase in the atomic number. Hence, 2s orbital (energy level) of potassium will have minimum energy than others.

Explanation:

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Answer 2

Answer:

Li

Explanation:

Li is 1st element of periodic table containing 2s.