1E.1

[nshahwan 1L]

1E.1 Which of the following increase when an electron in a lithium atom undergoes a transition from the 1s-orbital to a 2p-orbital? (a) Energy of the electron. (b) Value of n. (c) Value of l. (d) Radius of the atom. Which answers would be different for a hydrogen atom and in what way would they be different?
Could someone explain part c?

[Adrianh72]

The value of l increases because the l value for an s-orbital is 0 and the l value for a p-orbital is 1.

[Letty Liu 2C]

The angular momentum quantum number is n-1, so going from 1s to 2s would increase this quantum number. For 1s, 1-0=1 and 2s is 2-1=1.

[Varadhan_3G]

'l' value regards the shape of the orbital--as it changes from spherical to polar when an electron goes from an s to a p orbital, the 'l' value changes from 0 to 1.