Consider the isoelectronic ions f− and na+. part a which ion is smaller? f− na+ submitmy answersgive up correct part b using the equation zeff=z−s and assuming that core electrons contribute 1.00 and valence electrons contribute 0.00 to the screening constant, s, calculate zeff for the 2p electrons in both ions. express your answers as integers. enter your answers numerically separated by a comma. zeff f−, zeff na+ = 7,9 e− submitmy answersgive up correct part c repeat this calculation using slater's rules to estimate the screening constant, s. express your answers using two decimal places. enter your answers numerically separated by a comma.

Zeff is a good nuclear charge and is calculated by the formula:

Zeff = Z - S

Z refers to the quantity of protons and S is that the Slater constant.

Cations have 11 protons, the quantity of core electrons in sodium-ion is 2.

If the core electron accounts for 1.00 and also the negatron accounts for 0.00 then S = 2 for both ions.

The F⁻ ion has 9 protons, the quantity of core electrons within the F⁻ ion is 2. Therefore, for F⁻: Zeff = 9 - 2 = 7

On the premise of Slater's rule, for s and p orbitals, electrons within the same shell contribute 0.35 and electrons within the n-1 shell contribute 0.85.

S = (0.85 × 2) + (0.35 × 7)

= 4.15

For Na⁺, Zeff = 11 - 4.15 = 6.85

For F⁻, Zeff = 9 - 4.15 = 4.85

Thus, Zeff for Na⁺ and F⁻ calculated per Slater's rules is 6.85 and 4.85, respectively.

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Grade: College

Subject: Chemistry

Keyword: Zeff, cations, core

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.