Atomic Structure - Result Question 73

####49. The state $S _1$ is

(2010)

(a) $1 s$

(b) $2 s$

(c) $2 p$

(d) $3 s$

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Answer:

Correct Answer: 49. (c)

Solution:

  1. $S _1$ is spherically symmetrical state, i.e. it correspond to a $s$-orbital. Also, it has one radial node.

Number of radial nodes $=n-l-l$

$$ \begin{array}{lc} \Rightarrow & n-0-1=1 \ \Rightarrow & n=2 \text { i.e. } S _1=2 s \text {-orbital. } \end{array} $$



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