Shielding Constant in Atomic Structure

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Questions and Answers

What is the effect of electrons close to the atom (n-2 or lower) on shielding?

  • They have a complex interaction with the electron of interest
  • They completely negate the shielding (correct)
  • They have no effect on the shielding constant
  • They increase the shielding constant

What is the Slater Rule used for in calculating the shielding constant?

  • To calculate the shielding constant for a specific electron (correct)
  • To calculate the effective nuclear charge of an atom
  • To determine the electron configuration of an atom
  • To determine the type of electron in an atom

What is the significance of the electron configuration of an atom in shielding calculations?

  • It is used to determine the shielding constant for a specific electron
  • It is used to identify the electron of interest in shielding calculations (correct)
  • It is used to determine the type of electron of interest
  • It is used to calculate the effective nuclear charge of an atom

What is the effect of the 2s and 2p electrons on the shielding constant of a 2p electron in a nitrogen atom?

<p>They increase the shielding constant by 0.35 'charges' (A)</p> Signup and view all the answers

Why are the electrons to the right of the 3d electrons in the electron configuration of a bromine atom ignored in shielding calculations?

<p>They are not relevant to the shielding constant of the 3d electron (C)</p> Signup and view all the answers

What is the formula for calculating the effective nuclear charge (Zeff) of an atom?

<p>Zeff = Z - S (C)</p> Signup and view all the answers

What is the purpose of calculating the shielding constant (S) in atomic physics?

<p>To understand the behavior of electrons in an atom (C)</p> Signup and view all the answers

What is the significance of the shielding constant (S) in the calculation of the effective nuclear charge (Zeff) of an atom?

<p>It is subtracted from the total nuclear charge to get the effective nuclear charge (B)</p> Signup and view all the answers

What is the primary reason for the increase in radius of an atom when it gains an electron to become an anion?

<p>The force of attraction on the electrons decreases (C)</p> Signup and view all the answers

According to Linus Pauling's method, what is the significance of Δ Bond Energies being zero?

<p>The atoms X and Y have similar electronegativities (C)</p> Signup and view all the answers

What is the relationship between the charge on the ion and its radius?

<p>As the charge on the ion becomes more positive, the radius decreases (B)</p> Signup and view all the answers

What is the primary factor that determines the number of electrons that can be misplaced or gained to form ions?

<p>The number of protons in the nucleus (D)</p> Signup and view all the answers

What is the trend observed in the size of an atom or ion as the atomic number increases in a given period of the Periodic Table?

<p>The size of the atom or ion increases (B)</p> Signup and view all the answers

What is the result of a polar molecule forming when the electronegativities of X and Y are not similar?

<p>One atom becomes moderately negative (C)</p> Signup and view all the answers

What is the significance of the equations (1) and (4) in the text?

<p>They are used to evaluate the values of r(C+) and r(A-) (D)</p> Signup and view all the answers

What is the primary purpose of Linus Pauling's method of explaining electronegativity?

<p>To compare the affinities of two atoms with respect to each other (D)</p> Signup and view all the answers

What is the term used to describe atoms and ions with the same electron configuration?

<p>Isoelectronic (D)</p> Signup and view all the answers

Which of the following isoelectronic series has the electron configuration [Ne]3s23p6?

<p>P3–, S2–, Cl–, Ar, K+, Ca2+, and Sc3+ (D)</p> Signup and view all the answers

What determines the size of isoelectronic atoms and ions?

<p>The number of protons (D)</p> Signup and view all the answers

What is the main difference between the Mulliken scale and the Pauling scale of electronegativity?

<p>One is based on bond dissociation energies and the other is based on atomic properties (B)</p> Signup and view all the answers

Why does the atomic size of Ge decrease compared to Si?

<p>Due to the poor screening effect of 3d electrons (B)</p> Signup and view all the answers

What is the term used to describe the energy required to remove the most loosely bound electron from a gaseous atom in its ground state?

<p>Ionization energy (A)</p> Signup and view all the answers

What is the significance of the Mulliken definition of electronegativity?

<p>It is more intuitive than the Pauling definition (A)</p> Signup and view all the answers

Why is it easier to remove the most loosely bound electron from larger atoms?

<p>Because the electron is farther from the nucleus (B)</p> Signup and view all the answers

What is the basis of the Allred-Rochow Electronegativity?

<p>Electrostatic force exerted by the effective nuclear charge on the valence electrons (C)</p> Signup and view all the answers

What is the process of removing electrons from atoms or ions?

<p>Endothermic (C)</p> Signup and view all the answers

What is the purpose of Slater's rules?

<p>To determine the effective nuclear charge for the Allred-Rochow Electronegativity (B)</p> Signup and view all the answers

Why do ionization energy values (IE) always have a positive sign?

<p>Because energy is always required (A)</p> Signup and view all the answers

Why is the Mulliken electronegativity considered a better indicator of an atom's ability to draw electrons toward itself in bonding?

<p>Because it is more intuitive than the Pauling definition (C)</p> Signup and view all the answers

What can be said about the correlation between the Mulliken and Pauling electronegativities?

<p>There is a good correlation between the two (C)</p> Signup and view all the answers

What is a limitation of the Allred-Rochow Electronegativity?

<p>It is based on partly empirical rules (D)</p> Signup and view all the answers

What is the main purpose of discussing the different electronegativity scales?

<p>To understand the relationship between electronegativity and the tendency of atoms to form positive or negative ions (A)</p> Signup and view all the answers

How does effective nuclear charge, $Z_{ ext{eff}}$, change as one moves from left to right across a period?

<p>It increases. (A)</p> Signup and view all the answers

What major factor explains why atoms with more electrons can have smaller atomic radii?

<p>Higher effective nuclear charge pulls electrons closer. (D)</p> Signup and view all the answers

Which electrons are most effective at shielding outer electrons from the nucleus?

<p>Core electrons (B)</p> Signup and view all the answers

Why do outermost electrons have higher energies and are easier to remove?

<p>They are farthest from the nucleus and are shielded more. (B)</p> Signup and view all the answers

What happens to the atomic radius as one moves down a group in the periodic table?

<p>It increases. (B)</p> Signup and view all the answers

Which elements experience a stronger pull on their electrons, leading to smaller covalent radii?

<p>Elements on the right side of the periodic table (D)</p> Signup and view all the answers

When representative elements form cations, which electrons do they predominantly lose?

<p>Last added ns or np electrons (D)</p> Signup and view all the answers

How is shielding determined for a given electron?

<p>By the probability of another electron being between it and the nucleus and electron-electron repulsions (D)</p> Signup and view all the answers

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