Chapter Exam

Chapter 8: Periodic Classification of Elements — Online MCQ Test

Q: The Modern Periodic Law states that the properties of elements are periodic functions of their:

Answer: B. Atomic number — Modern periodic law is based on atomic number, which represents the number of protons in an atom.

Q: Which of the following is a transition metal?

Answer: C. Iron — Iron belongs to the d-block elements, which are known as transition metals.

Q: As we move from left to right across a period, the atomic radius:

Answer: B. Decreases — Increasing nuclear charge pulls the electrons closer to the nucleus, causing the atomic radius to decrease.

Q: If an element X has an atomic number of 17, which group does it belong to?

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).

Q: The process of extracting a metal from its ore is called:

Answer: B. Metallurgy — Metallurgy is the scientific process of extracting metals in their pure form from their ores.

SCIENCE · CLASS 10th · Tamil Nadu State Board

Practice Chapter 8: Periodic Classification of Elements with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 10th SCIENCE. 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.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 8: Periodic Classification of Elements — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 10th SCIENCE — Chapter 8: Periodic Classification of Elements, with answers and explanations. These are sample questions; the exam has its own separate question set.

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.

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.

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.

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 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.

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