Which element is placed in the same period as ruthenium but has a higher atomic number than it?

The question is incomplete. Complete question is:
Which element is placed in the same period as ruthenium but has a higher atomic number than it?
bismuth
osmium
silver
zirconium

Correct answer is Silver.

Reason:
From the periodic table, it can be seen that, silver and ruthenium are placed in the same period i.e. 5th period of periodic table. But the atomic number of ruthenium is 44, while that of silver is 47. 

Inot sure what it is i sorry : ((

Determine the  wavelength of light emitted when an electron  in an li2+ ion  makes a transition from an orbital with n  =  6 to an orbital with n  = 5.