9th class Chemistry, Chapter 8: Periodic Table and Periodicity MCQs

1. In which period and group will you place the element which is an important part of the solar cell?

1. (A) Third period and 14th group ✓
2. (B) Second period and 14th group
3. (C) Third period and 15th group
4. (D) Third period and 16th group

2. Identify the electronic configuration of the outermost shell of a transition metal.

1. (A) ns²np⁴
2. (B) ndˣns² ✓
3. (C) ns²np⁶
4. (D) ns²np⁵

3. Which is the softest metal?

1. (A) Na ✓
2. (B) Ca
3. (C) Al
4. (D) Zn

4. A yellow solid element exists in allotropic forms which is also present in fossil fuels. Indicate the name.

1. (A) Carbon
2. (B) Iodine
3. (C) Aluminium
4. (D) Sulphur ✓

5. How many electrons can nitrogen accept in its outermost shell?

1. (A) 2
2. (B) 3 ✓
3. (C) 4
4. (D) 5

6. Which element is the most reactive element?

1. (A) Oxygen
2. (B) Chlorine
3. (C) Fluorine ✓
4. (D) Nitrogen

7. Which element has the highest melting point?

1. (A) Na ✓
2. (B) K
3. (C) Rb
4. (D) Cs

8. In what order does the metallic character change in the second group?

1. (A) Mg > Ca > Ba > Sr
2. (B) Sr > Ba > Ca > Mg
3. (C) Mg > Sr > Ca > Ba
4. (D) Ba > Sr > Ca > Mg ✓

9. Which of the following best describe the correct order of oxygen, fluorine, and nitrogen's atomic radii?

1. (A) O < F < N
2. (B) N < F < O
3. (C) F < O < N ✓
4. (D) O < N < F

10. The element having less value of ionization energy and less value of electron affinity is likely to belong to:

1. (A) Group 1 ✓
2. (B) Group 13
3. (C) Group 16
4. (D) Group 17

11. The modern periodic table is based on the arrangement of elements according to increasing:

1. (A) Number of neutrons
2. (B) Atomic number ✓
3. (C) Atomic mass
4. (D) Density

12. The vertical columns of the periodic table are called:

1. (A) Blocks
2. (B) Shells
3. (C) Groups ✓
4. (D) Periods

13. The repetition of properties of elements after regular intervals is called:

1. (A) Periodicity ✓
2. (B) Allotropy
3. (C) Isotopy
4. (D) Equilibrium

14. Mendeleev arranged elements in his periodic table in ascending order of their:

1. (A) Atomic numbers
2. (B) Electronegativities
3. (C) Densities
4. (D) Atomic masses ✓

15. The scientist who arranged elements by atomic numbers was:

1. (A) Moseley ✓
2. (B) Mendeleev
3. (C) Dalton
4. (D) Bohr

16. The total number of periods in the modern periodic table is:

1. (A) Nine
2. (B) Seven ✓
3. (C) Eight
4. (D) Eighteen

17. The number of elements in the 4th period is:

1. (A) 2
2. (B) 18 ✓
3. (C) 8
4. (D) 32

18. The first period is called a:

1. (A) Short period ✓
2. (B) Normal period
3. (C) Long period
4. (D) Very long period

19. Each period except the first starts with an alkali metal and ends with a:

1. (A) Noble gas ✓
2. (B) Halogen
3. (C) Transition metal
4. (D) Alkaline earth metal

20. The lanthanide series starts after:

1. (A) Lanthanum (La = 57) ✓
2. (B) Actinium (Ac = 89)
3. (C) Barium (Ba = 56)
4. (D) Hafnium (Hf = 72)