Chapter 8: Periodic Classification of Elements — Online MCQ Test
SCIENCE · CLASS 10th · Tamil Nadu State Board
Practice Chapter 8: Periodic Classification of Elements with a free chapter-wise online MCQ test.
This chapter covers: Focusing on modern periodic law this chapter details periodic table trends atomic radius ionization energy electron affinity and electronegativity. Students explore metallurgy proc....
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Chapter 8: Periodic Classification of Elements — Important Questions & Answers
The Modern Periodic Law states that the properties of elements are periodic functions of their:
- A. Atomic mass
- B. Atomic number
- C. Number of neutrons
- D. Atomic volume
Answer: B. Atomic number
Modern periodic law is based on atomic number, which represents the number of protons in an atom.
Modern periodic law is based on atomic number, which represents the number of protons in an atom.
Which of the following is a transition metal?
- A. Sodium
- B. Calcium
- C. Iron
- D. Aluminum
Answer: C. Iron
Iron belongs to the d-block elements, which are known as transition metals.
Iron belongs to the d-block elements, which are known as transition metals.
As we move from left to right across a period, the atomic radius:
- A. Increases
- B. Decreases
- C. Remains constant
- D. First increases then decreases
Answer: B. Decreases
Increasing nuclear charge pulls the electrons closer to the nucleus, causing the atomic radius to decrease.
Increasing nuclear charge pulls the electrons closer to the nucleus, causing the atomic radius to decrease.
If an element X has an atomic number of 17, which group does it belong to?
- A. Group 1
- B. Group 2
- C. Group 17
- D. Group 18
Answer: C. Group 17
The electronic configuration of atomic number 17 is 2, 8, 7. It has 7 valence electrons, placing it in group 17 (halogens).
The electronic configuration of atomic number 17 is 2, 8, 7. It has 7 valence electrons, placing it in group 17 (halogens).
The process of extracting a metal from its ore is called:
- A. Alloying
- B. Metallurgy
- C. Valency
- D. Electronegativity
Answer: B. Metallurgy
Metallurgy is the scientific process of extracting metals in their pure form from their ores.
Metallurgy is the scientific process of extracting metals in their pure form from their ores.