Question

Among 1s and 2s orbital which has lesser energy​

Answer 1

Answer:

1s has less energy

Explanation:

we predict the energy of orbital by (n+l) rule .

greater the value of (n + l) higher is the energy

n = principal quantum number

l = azimuthal quantum number

• for 1s

n = 1

l = 0

n+l = 1

• for 2s

n = 2

l = 0

n+l = 2

clearly ( n+l ) value of 2s > ( n+l ) value of 1s

hence,

energy of 2s > energy of 1s

another way to predict is that orbital which have Lower energy is filled first . Now 1s is filed before 2s so it has lower energy than 2s.

hope it helps

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