Question

Which of the statement are correct ?
(1) An electron $4p$ orbital has more energy than one in $3p$ orbital
(2) An electron in $4s$ orbital is further from the nucleus than one in a $3s$ orbital
(3) the angular quantum number $1$ is related to orbital shape.
(4) Energy is released if electron moves from $n=2$ to $n=5$ level.

• A. $1,2$ and $3$
• B. $1$ and $3$
• C. $2$ and $4$
• D. Only $4$

Answer 1

Answer: (A)

$1,2$ and $3$

$n+l$rule
1) $4p=4+1$
$3p=3+1$
$4p>3p$
2) energy of $4s>3s$ so $4s$ is further
3) correct
4) $2$ to $5$ energy is absorbed $x$