Question

The correct increasing order of energy between $8s$ and $8p$ orbital are

• A. $7d,6f$
• B. $5g,6f,7d$
• C. $6d,7f$
• D. $6h,5g,6f,7d$

Answer 1

The correct option is B $5g,6f,7d$

Energy can be calculated by using the formula: $n+l$ , where $n$ is principal quantum number and $l$ is azimuthal quantum number.
$(n+l):8s\to 8+0=8$
$8p\to 8+1=9$
$5g\to 5+4=9$
$6f\to 6+3=9$
$7d\to 7+2=9$
$6h\to 6+5=11$
For same values of $n+l$, orbital with lower value of $n$ will have lower energy.
Hence,
Correct order $\to 8s5g6f7d8p$