Question

What is the energy in ev required to excite the electron from n=1 to n=2 state in hydrogen atom?

Answer 1

Soft metals like Pottasium & Sodiumare niether ductile nor malleable, so asliquid metal Mercury. Again brittlemetals are niether of the two like Cast Iron(general one). Gold is the most ductile & malleable of all know metals. Again Lead is a metal which is malleable but not ductile.

Answer 2

Answer:

10.2e.v

Explanation:

energy =13.6×(1/(n1)sq.-1/(n2)sq

by putting into the equation ,..

E= 13.6×( 1/1sq.-1/2sq.)

=13.6×3/4

=10.2e.v.