Which of the following would you expect to have the smallest atomic radius? a. C

Question

Which of the following would you expect to have the smallest atomic radius? a. Cs b. Ca c. P d. Cl Which of the following would you expect to have the lowest first ionization energy? a. Cs b. Ca c. P d. Cl Which of the following would you expect to have the lowest electron affinity? a. Na b. Ar c. P d. Cl Which of the following are isoelectronic with one another? a. Cs, Cs^+ b. Ca, K c. P^3-, S^2- d. Cl^- Br^- In the photoelectron effect, a given metal must be irradiated light of a minimum intensity (or greater) in order for an electron to be ejected from its surface, regardless of the frequency of the light. a. True b. False The Pauli exclusion principle states that A) the wavelength of a photon of light times its frequency is equal to the speed of light. B) no two electrons in the same atom can have the same set of four quantum numbers.

Explanation / Answer

6. Chlorine (Option d) has the smallest atomic radius among the given elements. This can be justified by the statement "Atomic Radii decreases as one moves from left to right, across the periodic table".

7. Cesium (Option a) has the smallest first ionisation energy among the given elements. This can be explained by using periodic trend of first ionisation energy. It decreases while moving from top to bottom in a group due to increase in atomic radius and also increase in shielding effect. First IE increases from left to right across a period.

8. Argon (Option c) has the lowest electron affinity.Electron Affinity of an atom is defined as the amount of energy released when an electron is added to a neutral atom in gaseous state.Usually, atoms accept electron to fulfill their octet configuration. As noble gas Argon already has a completely filled octet, its electron affinity is 0.Thus it has the lowest electron affinity among the given elements.

9. Option c are isoelectronic species. P^3- and S^2- are isoelctronic with 18 electrons each. Where as the other pairs in the given options have an unequal number of electrons and are not isoelectronic.

10.False (Option b). In photo electric effect, photo electrons are emitted from the surface of a metal only when it is irradiated with certain frequency called "Threshold Frequency" irrespective of the intensity of the radiation.

11. Pauli Exclusion Principle states that "No two electrons in the same atom can have the same set of all four quantum numbers ".

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.