9th Class Chemistry Chapter 4 Test04. Periodic Table and Periodicity of Properties

Q1. Multiple choice questions (Attempt all · 8 × 1 = 8)

1. Who discovered atomic number?
   1. Moseley
   2. Bohr
   3. Rutherford
   4. Cannizaro
2. Which of the following elements belongs to VIII A?
   1. Na
   2. Mg
   3. Br
   4. Xe
3. What is the sheilding effect?
   1. increase in nuclear charge
   2. decrease in atomic size
   3. reduction in force
   4. increase in ionization energy
4. How does electron affinity change as you move down a group?
   1. increase
   2. decreases
   3. remains constant
   4. fluctuates
5. As you move from right to left across a period, which of the following does not increase:
   1. electron affinity
   2. ionization energy
   3. nuclear charge
   4. shielding effect
6. Which of the following groups contain alkaline earth metals?
   1. I A
   2. II A
   3. VII A
   4. VIII A
7. Valence shell electronic configuration of an element M (atomic no. 14) is:
   1. 2s2, 2p1
   2. 2s2, 2p2
   3. 2s2, 2p3
   4. 3s2, 3p2
8. All the elements of Group II A are less reactive than alkali metals. This is because these elements have:
   1. high ionization energies
   2. relatively greater atomic sizes
   3. similar electronic configuration
   4. decreased nuclear charge