# Problem: Among elements 1–18, which element or elements have the smallest effective nuclear charge if we use Equation 7.1 to calculate Zeff? Which element or elements have the largest effective nuclear charge?

###### FREE Expert Solution

Recall that the effective nuclear charge is the force exerted by the nucleus onto an electron and is given by:

$\overline{){{\mathbf{Z}}}_{{\mathbf{eff}}}{\mathbf{=}}{\mathbf{Z}}{\mathbf{-}}{\mathbf{S}}}$

The shielding constant, S = core electrons

For the elements:

• Hydrogen: 1s → core e- = 0
• Z = 1, S = 0
• Zeff = 1 - 0 = 1
95% (157 ratings) ###### Problem Details

Among elements 1–18, which element or elements have the smallest effective nuclear charge if we use Equation 7.1 to calculate Zeff? Which element or elements have the largest effective nuclear charge?

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