Approximate values are given for two alkali metals: , ; ,

PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

Approximate values are given for two alkali metals: Zeff(Li)=1.3Z_{\text{eff}}(\text{Li}) = 1.3, rLi=152 pmr_{\text{Li}} = 152\,\text{pm}; Zeff(Na)=1.0Z_{\text{eff}}(\text{Na}) = 1.0, rNa=186 pmr_{\text{Na}} = 186\,\text{pm}. Calculate the ratio FLiFNa\dfrac{F_{\text{Li}}}{F_{\text{Na}}} of the electrostatic force of attraction between the nucleus and a valence electron in lithium compared with that in sodium. Round your answer to one decimal place and indicate which element’s nucleus exerts the stronger attraction.

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