The Structure of Atom Worksheet-6

The Structure of Atom Worksheet-6

1. In which of the following pairs of shells, energy difference between two adjacent orbits is minimum?

(a) K, L               (b) L, M             (c) M, N             (d) N, O

2. Which among the following pairs have different number of valence electrons?

(a) Na⁺, Al⁺³     (b) P^–3, Ar        (c) Mg⁺², Ar      (d) O^–2, F^–

3. Which of the following particles do not produce electronic spectra?

(a) Li⁺²               (b) He⁺²            (c) Be⁺²             (d) Na⁺

4. A stable unipositive ion of an element contains three fully filled orbits. What is the atomic number of the element?

(a) 20                 (b) 19                  (c) 18                  (d) 17

5. Rutherford’s atomic model is also known as the :

(a) Primary Model                       (b) Planetary Model

(c) Initial Model                           (d) Hypothetical Model

6. The protons and neutrons are collectively called -

(a) deuterons    (b) positrons     (c) mesons         (d) nucleons

7. The main defect of the Rutherford’s atomic model was :

(a) It contradicted the Nature of Nucleus

(b) It Contradicted the classical law of thermodynamics

(c) It contradicted the Nature of electron

(d) It contradicted the Nature of proton

8. The presence of positively charged particles in an atom has been predicted gy Goldstein. This prediction was made on the basis of which of the following observations:

(a) The electrical neutrality of the atom

(b) The electrical neutrality of electrons

(c) The electrical neutrality of protons

(d) None of these

9. Which of the following experiments disapproved the Thomson’s Model of the Atom?

(a) Gamma ray scattering experiment

(b) Delta ray scattering experiment

(c) Alpha–ray scattering experiment

(d) Beta ray scattering experiment

Answer Key:

(1)-(d); (2)-(c); (3)-(b); (4)-(b); (5)-(b); (6)-(d); (7)-(b); (8)-(a); (9)-(c)