(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

If ionization energy is 899.4 kJ/mol for Be, what is the effective nuclear charge?

2. Relevant equations

Z_{eff}= Z - S

E=R_{H}(Z^{2}/n^{2}) ??

E=R_{H}(Z_{eff}^{2}/n^{2})??

3. The attempt at a solution

My attempted solution was subbing into

Z_{eff}= Z - S

Z_{eff}= 4 - 2

= 2

But I suspect that is wrong... because why ionization energy is given.. so shouldn't it be used in the calculation?

And somewhere I think I read that "S" was supposed to be a "constant" of some sort, and I just subbed 2 in because I thought that it was the number of electrons in the first orbital ?

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# Calculating effective nuclear charge

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