Calculating the n=1 Energy Level of B4+ Ion

[jessiewills]

What is the energy of the n = 1 energy level in the
B4+ hydrogen-like ion?
I need it to 4 significant figures...
I know the equation is

En=Z squared X -13.60 /n squared... however I can't work out the answer to four significant figs

 

[phyzguy]

Why not? You have 13.60 to 4 significant figures. What is Z? What is n?

 

[jessiewills]

Z= 5 for the B and the n= 1 for the energy?

 

[phyzguy]

Sounds good. So what's the answer?

 

[jessiewills]

-340...but its needed in 4 significant figures? and i really don't understand how i can get that too it...im dumb :/

 

[phyzguy]

You started with 13.6, but it was 13.60 to 4 significant figures, so what is 340 to 4 significant figures?

 

[jessiewills]

340.0...really? that simple also do i need to keep it to minus or does it change?

 

[phyzguy]

It's that simple. Yes, it is negative as you originally had it.