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:
- $S _1$ is spherically symmetrical state, i.e. it correspond to a $s$-orbital. Also, it has one radial node.
Number of radial nodes $=n-l-l$
$$ \begin{array}{lc} \Rightarrow & n-0-1=1 \ \Rightarrow & n=2 \text { i.e. } S _1=2 s \text {-orbital. } \end{array} $$
