Calculating the n=1 Energy Level of B4+ Ion

AI Thread Summary
The energy of the n = 1 level for the B4+ ion can be calculated using the formula En = Z² × -13.60/n², where Z is 5 and n is 1. The calculation results in an energy value of -340.0 eV when expressed to four significant figures. It is important to maintain the negative sign in the final answer, as it reflects the bound state of the electron. The discussion clarifies that 340 can be represented as 340.0 to meet the significant figures requirement. The final answer is -340.0 eV.
jessiewills
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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
 
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Why not? You have 13.60 to 4 significant figures. What is Z? What is n?
 
Z= 5 for the B and the n= 1 for the energy?
 
Sounds good. So what's the answer?
 
-340...but its needed in 4 significant figures? and i really don't understand how i can get that too it...im dumb :/
 
You started with 13.6, but it was 13.60 to 4 significant figures, so what is 340 to 4 significant figures?
 
340.0...really? that simple also do i need to keep it to minus or does it change?
 
It's that simple. Yes, it is negative as you originally had it.
 
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