Question

For which of the following orbital wave function does not change from positive to negative at any distance from nucleus?

• A. $1s$
• B. $2p$
• C. $2s$
• D. $3d$

Answer 1

The correct option is A $1s$

The wave functions for the hydrogen atom depend upon the three variables $r,\Theta ,\varphi$ and the three quantum numbers $n,l,m_l$.For 1s value of $n$ is 1 and $l,m_l$ value is zero so orbital wave function does not change from positive to negative at any distance from nucleus.