Question

The second line of Lyman series of H coincides with the last line of paschen series of an ionic species
X. Find X assuming Rydberg constant to same for both H and X.
(A) Li2+ ion
(B) Li* ion
(C) Heion
(D) He2+ ion​

Answer 1

Answer:

$\huge{\underline{\mathtt{\red{❥A}\pink{N}\green{S}\blue{W}\purple{E}\orange{R}}}}$For Hydrogen, 2

nd

line of Lyman series: n=3

For 6

th

line of Paschen series: n=9

Z H 2

( 11 - 321 ) = z

X2

( 321 - 921 )

98 = Z X2

×( 91 - 811 )

98 = × 81 8

Z×2 = 9

Z × 9

(Li + 2 )